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|length_mi=102.63
|length_ref=<ref name=DelDOT>{{cite web |author = Staff |title = Traffic Count and Mileage Report: Interstate, Delaware, and US Routes |publisher = [[Delaware Department of Transportation]] |year = 2018 |url = https://deldot.gov/Publications/manuals/traffic_counts/pdfs/2018/2018Interstate_USRoutes_DelawareRoutes.pdf?cache=1585496964656 |format = PDF |access-date = March 29, 2020 }}</ref>
|maint=[[Delaware Department of Transportation|DelDOT]] and [[United States Army Corps of Engineers|USACE]]
|established=1974<ref name="MD 1974 map"/>
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|direction_b=North
|terminus_a={{jct|state=MD|MD|528}} in [[Fenwick Island, Delaware|Fenwick Island]]
|junction=
*{{jct|state=DE|US|9|DE|404}} in [[Nassau, Delaware|Nassau]]
*{{jct|state=DE|US|113}} in [[Milford, Delaware|Milford]]
Line 32:
*{{jct|state=DE|DE|273}} near [[Christiana, Delaware|Christiana]]
*{{jct|state=DE|DE|7}} in Christiana
|terminus_b={{jct|state=DE|I|95|DE|7}} in Christiana
|counties=[[Sussex County, Delaware|Sussex]], [[Kent County, Delaware|Kent]], [[New Castle County, Delaware|New Castle]]
Line 40 ⟶ 39:
|next_route=1A
}}
'''Delaware Route 1''' ('''DE 1''') is the longest numbered [[state highway]] in the U.S. state of [[Delaware]]. The route runs {{convert|102.63|mi|km|abbr=on}} from the [[Maryland]] state line in [[Fenwick Island, Delaware|Fenwick Island]], [[Sussex County, Delaware|Sussex County]], where the road continues south into that state as [[Maryland Route 528]] (MD 528), north to an interchange with [[Interstate 95 in Delaware|Interstate 95]] (I-95) in [[Christiana, Delaware|Christiana]], [[New Castle County, Delaware|New Castle County]], where the
DE 1 was first designated in the 1970s from Fenwick Island north to [[U.S. Route 113|US 113]] in Milford, replacing a portion of [[Delaware Route 14|DE 14]] south of Milford and following the newly-constructed Milford Bypass. DE 14 between Fenwick Island and Milford had been built as a state highway in the 1920s and 1930s and was widened into a divided highway between the 1950s and 1970s. In the 1980s, a controlled-access "Relief Route" of US 13 was proposed between Dover and the Wilmington area in order to relieve that route of beach traffic. This proposed highway was incorporated into DE 1 in 1988, with the route extended north [[concurrency (road)|concurrent]] with US 113 between Milford and Dover to connect to the Relief Route. The DE 1 freeway between Dover Air Force Base and Christiana opened in multiple stages between 1991 and 2003, and at a cost of $900 million was the largest public works project in Delaware history. The concurrent US 113 designation between Milford and Dover Air Force Base was removed in 2004. Upgrades continue to be made to DE 1 such as the construction and improvement of interchanges as well as widening portions of the road.
Line 47 ⟶ 46:
DE 1 begins at [[Maryland Route 528|MD 528]] at the [[Maryland]] state line in [[Fenwick Island, Delaware|Fenwick Island]], where it heads north along a multilane [[divided highway]] called Coastal Highway through the [[Delaware Beaches]] resort area along the [[Atlantic Ocean]], crossing the [[Indian River Inlet]] on the [[Indian River Inlet Bridge]]. In [[Dewey Beach, Delaware|Dewey Beach]], the route turns northwest away from the ocean, running through commercial development from [[Rehoboth Beach, Delaware|Rehoboth Beach]] to [[Nassau, Delaware|Nassau]]. DE 1 forms a [[concurrency (road)|concurrency]] with [[U.S. Route 9 in Delaware|US 9]] from [[Carpenters Corner, Delaware|Carpenters Corner]] to Nassau. Past Nassau, DE 1 leaves the Delaware Beaches resort area and runs northwest through rural areas in northern [[Sussex County, Delaware|Sussex County]]. The route bypasses [[Milford, Delaware|Milford]] to the east along the Milford Bypass, crossing into [[Kent County, Delaware|Kent County]]. After an interchange with the northern terminus of [[U.S. Route 113|US 113]], DE 1 heads north along Bay Road through more rural areas, passing east of [[Frederica, Delaware|Frederica]]. The route becomes a [[freeway]] near [[Magnolia, Delaware|Magnolia]] and turns into a [[toll road]] called the Korean War Veterans Memorial Highway while passing [[Dover Air Force Base]]. DE 1 bypasses the city of [[Dover, Delaware|Dover]] to the east and begins to run parallel to [[U.S. Route 13 in Delaware|US 13]]. The route passes east of [[Smyrna, Delaware|Smyrna]] and enters [[New Castle County, Delaware|New Castle County]], where it crosses US 13 multiple times and heads west of [[Odessa, Delaware|Odessa]]. The road has an interchange with the northern terminus of the [[U.S. Route 301 in Delaware|US 301]] toll road in [[Biddles Corner, Delaware|Biddles Corner]]. The toll road portion of the route ends before it crosses the [[Chesapeake & Delaware Canal]] on the [[Senator William V. Roth Jr. Bridge]] in [[St. Georges, Delaware|St. Georges]]. DE 1 becomes concurrent with US 13 from [[Wrangle Hill, Delaware|Wrangle Hill]] to [[Tybouts Corner, Delaware|Tybouts Corner]], where US 13 splits to the northeast. The DE 1 freeway heads north and meets [[U.S. Route 40 in Delaware|US 40]] in [[Bear, Delaware|Bear]] before it comes to [[Christiana, Delaware|Christiana]], where [[Delaware Route 7|DE 7]] joins the route. The DE 1 designation ends at an interchange with [[Interstate 95 in Delaware|I-95]] and DE 7 continues north along the freeway to the [[Delaware Route 58|DE 58]] interchange, from which point DE 7 turns into a divided highway with at-grade intersections.<ref name="DE 2017 map"/><ref name="google"/>
DE 1 serves as a major route connecting northern Delaware to the Delaware Beaches and sees heavy traffic in the summer months. The peak travel periods in the summer are southbound on Friday evenings, both directions on Saturday afternoons, and northbound on Sunday afternoons.<ref>{{cite web |url = http://www.rehoboth.com/find-us.html#Wilmington |title = Directions to Rehoboth Beach, DE |publisher = Rehoboth.com |access-date = December 19, 2016 }}</ref><ref>{{cite web |title = Beach Travel Tips |publisher = Visit Delaware |url = http://www.visitdelaware.com/beaches/travel-tips/ |access-date = December 19, 2016 }}</ref><ref name=tnj7314>{{cite news |
===Fenwick Island to Nassau===
[[File:2022-07-14 17 10 00 View south along Delaware State Route 1 (Coastal Highway) just north of East Lewes Street in Fenwick Island, Sussex County, Delaware.jpg|thumb|right|DE 1 southbound entering Fenwick Island]]
DE 1 begins at the [[Maryland]] state line south of the [[Delaware Beaches]] town of [[Fenwick Island, Delaware|Fenwick Island]] in [[Sussex County, Delaware|Sussex County]], where the road continues south into the town of [[Ocean City, Maryland]], as [[Maryland Route 528|MD 528]]. From this point, DE 1 heads north on Coastal Highway, a four-lane [[divided highway]]. A block after the state line, the route intersects the eastern terminus of [[Delaware Route 54|DE 54]]. The road continues north into the town of Fenwick Island and heads through business areas with some residences a short distance to the west of the [[Atlantic Ocean]]. DE 1 passes west of the Bethany-Fenwick Area Chamber of Commerce Information Center as it leaves Fenwick Island and enters [[Fenwick Island State Park]], running along a narrow strip of land with the [[Little Assawoman Bay]] to the west and the Atlantic Ocean to the east. The route heads past a small area of residential development before it goes through more of the state park, running to the west of a [[fire control tower]] from [[World War II]]. The road runs through the community of [[York Beach, Delaware|York Beach]] and enters the town of [[South Bethany, Delaware|South Bethany]], where it passes through residential areas. DE 1 leaves South Bethany and heads into commercial areas in the community of [[Middlesex Beach, Delaware|Middlesex Beach]], briefly curving northwest before turning north again. The route continues into the town of [[Bethany Beach, Delaware|Bethany Beach]], where the road name changes to Delaware Avenue. DE 1 runs past residences and comes to an intersection with [[Delaware Route 26|DE 26]], which heads east into the commercial center of Bethany Beach. The road curves northeast and leaves Bethany Beach as it passes to the east of a [[Delaware National Guard]] training site. Continuing north, DE 1 becomes Coastal Highway again and heads past the community of [[Sussex Shores, Delaware|Sussex Shores]], running between wooded areas to the west and beachfront homes to the east. Farther north, the route crosses into [[Delaware Seashore State Park]], where it travels along a strip of land between the [[Indian River Bay]] to the west and the Atlantic Ocean to the east. DE 1 comes to a [[right-in/right-out]] access point to the South Inlet area of the park before it crosses over the [[Indian River Inlet]] on the [[Indian River Inlet Bridge]], a [[cable-stayed bridge]].<ref name="DE 2017 map">{{Delaware road map|year=2017|access-date=August 18, 2019}}</ref><ref name="google">{{google maps |url=
[[File:DE 1 SB approaching DE 24-DE 1D.jpeg|thumb|left|DE 1 southbound approaching DE 24/DE 1D in Midway]]
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[[File:US 13-DE 1 NB from School House Road overpass.jpeg|thumb|right|DE 1 and US 13 northbound south of Tybouts Corner]]
After the toll plaza, DE 1 widens to six lanes and comes to a southbound exit and northbound entrance with the northern terminus of the [[U.S. Route 301 in Delaware|US 301]] toll road. Immediately after, the route has a southbound exit and northbound entrance providing access to US 13 in the community of [[St. Georges, Delaware|St. Georges]]; the southbound exit connects to US 13 by way of Lorewood Grove Road while the northbound entrance consists of a direct ramp from US 13 starting from that route's intersection with Port Penn Road that merges into the ramp from US 301. This interchange marks the north end of the toll road portion of DE 1. The freeway turns northwest and crosses the [[Chesapeake & Delaware Canal]] and the Michael N. Castle Trail on the north bank of the canal on the cable-stayed [[Senator William V. Roth Jr. Bridge]]. The highway passes through a mix of fields and residential subdivisions and curves north, crossing [[Dragon Creek (Delaware River tributary)|Dragon Creek]] before coming to a [[diverging diamond interchange]] with US 13 and [[Delaware Route 72|DE 72]] near the community of [[Wrangle Hill, Delaware|Wrangle Hill]] to the west of the city of [[Delaware City, Delaware|Delaware City]]. At this point, US 13 becomes concurrent with DE 1, with the freeway running through farmland and passing over [[Norfolk Southern]]'s Reybold Industrial Track railroad line and [[Delaware Route 7|DE 7]] without access to the west of [[PBF Energy]]'s [[Delaware City Refinery]]. US 13/DE 1 cross [[Red Lion Creek]] and continue concurrent to the community of [[Tybouts Corner, Delaware|Tybouts Corner]], where DE 1 splits at an interchange to remain as a freeway and US 13 heads northeast as a divided highway with at-grade intersections. Within this interchange is the northern terminus of [[Delaware Route 71|DE 71]] at US 13; southbound DE 1 has a direct ramp to DE 71. Past Tybouts Corner, DE 1 narrows to four lanes and travels north past residential subdivisions, passing over Norfolk Southern's New Castle Secondary railroad line prior to a partial cloverleaf interchange at [[U.S. Route 40 in Delaware|US 40]] in [[Bear, Delaware|Bear]]. The highway gains a third auxiliary lane in each direction and continues north to a diamond interchange with [[Delaware Route 273|DE 273]] in [[Christiana, Delaware|Christiana]], where the auxiliary lanes end. Past this interchange, the freeway becomes six lanes and runs through wooded areas, crossing the [[Christina River]] before it comes to a partial cloverleaf interchange with DE 7 and Mall Road that serves the [[Christiana Mall]] and adjacent retail development to the east of the road. At this point, DE 7 joins DE 1 on the four-lane freeway, passing to the west of the shopping mall before DE 1 comes to its northern terminus at a modified [[cloverleaf interchange]] with [[Interstate 95 in Delaware|I-95]] (Delaware Turnpike) that has [[flyover (road)|flyover]] ramps from northbound DE 1 to northbound I-95 and from southbound I-95 to southbound DE 1; the flyover ramps split from DE 1 south of the DE 7 interchange. Past I-95, the freeway continues north as part of DE 7 to a partial cloverleaf interchange with [[Delaware Route 58|DE 58]]; this interchange uses the exit numbers from DE 1. In the southbound direction, a [[collector/distributor road]] serves both DE 58 (intersecting that road at-grade) and I-95. Past DE 58, DE 7 continues north as a divided highway with at-grade intersections.<ref name="DE 2017 map"/><ref name="google"/>
==Tolls==
[[Image:DE 1 SB at Biddles Corner toll plaza.jpg|thumb|right|The Biddles Corner mainline toll plaza, with high-speed E-ZPass lanes]]
The Korean War Veterans Memorial Highway portion of DE 1 is a toll road using a [[barrier toll system]], with mainline toll plazas at Dover and Biddles Corner and ramp tolls at exit 104 for US 13 in North Dover (southbound exit and northbound entrance), exit 114 for US 13 in South Smyrna (southbound exit and northbound entrance), and exit 142 for DE 896 in Boyds Corner (northbound exit and southbound entrance). Tolls may be paid with cash or [[E-ZPass]]. The mainline plazas are staffed by toll collectors and also feature high-speed E-ZPass lanes, whereas the ramp plazas are unattended; cash users here must pay by depositing exact change in a basket. As of August 1, 2014, the [[Delaware Department of Transportation]] (DelDOT) charges a total of $2 on weekdays and $6 on weekends for passenger vehicles to travel the entire length of the Korean War Veterans Memorial Highway, with the mainline toll plazas each charging passenger vehicles $1 on weekdays and $3 on weekends. Weekend tolls are in effect from 7:00 pm Friday until 11:00 pm Sunday. DelDOT charges passenger vehicles $0.50 for the ramp tolls at exit 104 and exit 142 and $0.25 for the ramp tolls at exit 114. A discount is available for motorists with E-ZPass exiting northbound and entering southbound at exits 104 and 114 north of the Dover toll plaza as well as entering northbound and exiting southbound at exit 142 south of the Biddles Corner toll plaza. This discount is $0.50 for passenger vehicles at exits 104 and 142 and $0.25 for passenger vehicles at exit 114.<ref name=DelDOTtolls>{{cite web |url = http://www.deldot.gov/public.ejs?command=PublicTollRateGrid |title = State Route 1 Toll Rate Grid |publisher = Delaware Department of Transportation |access-date = March 31, 2012 }}</ref> There is also a frequent user plan in which E-ZPass users who make at least 30 trips in 30 days receive a 50% discount on tolls.<ref name=deldot71414/>
Tolls at the mainline toll plazas were originally $1 for passenger vehicles the whole week.<ref name=deldot92707/> E-ZPass became operational along DE 1 on April 6, 1999,<ref>{{cite news |title = EZ Pass |work = On the Road |publisher = Delaware Department of Transportation |issue = 23 |date = Summer 1999 |page = 2 |url = http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-23.pdf |access-date = April 5, 2017 |url-status = dead |archive-url = https://web.archive.org/web/20050211060705/http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-23.pdf |archive-date = February 11, 2005 }}</ref> and the Biddles Corner mainline toll plaza opened with high-speed E-ZPass lanes in the same year.<ref>{{cite web |url = http://www.deldot.org:80/static/projects/sr1/4th.html |title = State Route 1 Odessa to the Canal Overview |work = Internet Archives WayBack Machine |publisher = Delaware Department of Transportation |access-date = February 19, 2018 |archive-url = https://web.archive.org/web/20030624021323/http://www.deldot.org/static/projects/sr1/4th.html |archive-date = June 24, 2003 |url-status = dead |df = mdy-all }}</ref> On May 24, 2004, a dedication ceremony was held marking the completion of construction of high-speed E-ZPass lanes at the Dover mainline toll plaza, with DelDOT secretary Nathan Hayward III and Dover Mayor [[Stephen Speed]] in attendance; the lanes opened to traffic on May 27.<ref>{{cite press release |title = Dedication Ceremony Held For Opening Of E-ZPass Express Lanes at the Dover Toll Plaza |publisher = Delaware Department of Transportation |date = May 24, 2004 |url = https://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=1823 |access-date = February 19, 2018 }}</ref> On October 1, 2007, tolls on weekends at the mainline toll plazas were increased to $2 for passenger vehicles in order to fund statewide transportation projects. Commercial vehicle tolls also increased by $1 on weekdays and $2 on weekends at this time.<ref name=deldot92707>{{cite web |title = Tolls, Motor Vehicle Fees Increase October 1 |publisher = Delaware Department of Transportation |date = September 27, 2007 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=2800 |access-date = July 16, 2014 }}</ref> On August 1, 2014, the weekend tolls at Dover and Biddles Corner increased to $3 for passenger vehicles in order to again provide funding to transportation projects across the state.<ref name=deldot71414>{{cite web |title = Delaware Route 1 Toll Increases Effective Aug. 1st |publisher = Delaware Department of Transportation |date = July 14, 2014 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=5214&type=News |access-date = July 16, 2014 }}</ref> On March 17, 2020, cash tolls were suspended at the Dover and Biddles Corner mainline toll plazas along DE 1 due to the [[COVID-19 pandemic]], with all tolls collected electronically through the high-speed E-ZPass lanes and motorists without E-ZPass billed by mail; cash tolls resumed on May 21, 2020.<ref>{{cite news |last = Gamard |first = Sarah |title = No cash at toll booths: Delaware drivers to be sent into EZPass lanes; bill will come in mail |work = The News Journal |location = Wilmington, DE |date = March 16, 2020 |url = https://www.delawareonline.com/story/news/politics/2020/03/16/no-cash-toll-booths-delaware-drivers-sent-into-ezpass-lanes-bill-come-mail/5061696002/ |access-date = January 23, 2023 }}</ref><ref>{{cite news |last = Perez |first = Nick |title = Delaware's toll plazas resume cash collection |work = The News Journal |location = Wilmington, DE |date = May 22, 2020 |url = https://www.delawareonline.com/story/news/2020/05/22/delaware-toll-plazas-resumed-cash-collection/5248084002/ |access-date = January 23, 2023 }}</ref>
==History==
===South of Dover===
[[File:DE 1 NB from DE 12 overpass.jpeg|thumb|right|DE 1 northbound at the DE 12 interchange near Frederica]]
The portion of DE 1 between Milford and Little Heaven was initially built as part of the DuPont Highway, a highway that spanned the state from [[Selbyville, Delaware|Selbyville]] north to [[Wilmington, Delaware|Wilmington]]. The highway was proposed as a modern road that would improve travel and bring economic development to Kent and Sussex counties as part of a philanthropic measure. The DuPont Highway was to be modeled after the great boulevards of [[Europe]] and was to have a {{convert|200|ft|m|adj=on}} wide right-of-way consisting of a {{convert|40|ft|m|adj=on}} wide roadway for automobiles flanked by dual [[Tram|trolley]] lines, {{convert|30|ft|m|adj=on}} wide roadways for heavy vehicles, {{convert|15|ft|m|adj=on}} wide unpaved roadways for horses, and sidewalks. Utilities were to be buried underground below the horse roadways. The highway was also to include agricultural experimental stations and monuments for future surveying. Trolley revenues would help pay for the construction of the roadway. After portions of the DuPont Highway were built, these portions were planned to be turned over to the state at no charge.<ref name="Milner-6-8">
In 1911, the Coleman DuPont Road, Inc. was established and construction on the highway began.<ref name="Milner-10"/> By 1912, construction was interrupted by litigation challenging both the constitutionality of the law establishing the road building corporation and the need for DuPont to acquire such a large right-of-way.<ref name="Milner-13">{{harvp|John Milner Associates|2005|p= 13}}.</ref> DuPont would narrow the proposed right-of-way to {{convert|100|ft|m}} in order to compromise with opponents of the highway in addition to offering landowners whose properties were affected by the highway five times the assessed value of the land five years after the highway was completed.<ref name="Milner-10">{{harvp|John Milner Associates|2005|p= 10}}.</ref> The DuPont Highway would end up being built on a {{convert|60|ft|m|adj=on}} alignment with a {{convert|32|ft|m|adj=on}} wide roadway. The DuPont Highway north of Milford would be both designed and constructed by Delaware State Highway Department (DSHD).<ref name="Milner-14">{{harvp|John Milner Associates|2005|p= 14}}.</ref> A portion of the road north of Milford and from Frederica to Little Heaven were completed by 1920.<ref name="DE 1920 map"/> The portion of the DuPont Highway from north of Milford to Frederica was under construction in 1920 and completed by 1923, the same year the last section of the entire Selbyville–Wilmington highway was completed near Odessa.<ref name="Milner-16">{{harvp|John Milner Associates|2005|p= 16}}.</ref> When the [[U.S. Highway System]] was designated in 1926, this portion of the DuPont Highway became a part of US 113.<ref name="1925 report">{{cite book |title = Annual Report of the State Highway Department |edition = 1925 |page = 17 |publisher = Delaware State Highway Department |location = Dover |date = December 31, 1925 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1925/annual_1925.pdf |access-date = January 30, 2014 |archive-date = September 23, 2015 |archive-url = https://web.archive.org/web/20150923213414/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1925/annual_1925.pdf |url-status = dead }}</ref><ref name="USHM">{{cite map |author1 = [[Bureau of Public Roads]] |author2 = [[American Association of State Highway Officials]] |date = November 11, 1926 |title = United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials |url = https://commons.wikimedia.org/wiki/File:United_States_System_of_Highways_Adopted_for_Uniform_Marking_by_the_American_Association_of_State_Highway_Officials.jpg |scale = 1:7,000,000 |location = Washington, DC |publisher = [[United States Geological Survey]] |oclc = 32889555 |access-date = November 7, 2013 |via = [[Wikimedia Commons]] |name-list-style = amp }}</ref>
The portion of DE 1 between Little Heaven and Dover Air Force Base was built as part of a Dover bypass for US 113. This bypass was built atop existing Bay Road north of the present-day DE 9 interchange and on a new alignment south of there.<ref name="1934 report">{{cite book |title = Annual Report of the State Highway Department of the State of Delaware |edition = 1934 |pages = 9, 16, 39 |publisher = Delaware State Highway Department |location = Dover |date = January 1, 1935 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1934/annual_1934_chief.pdf |access-date = October 22, 2014 |archive-date = May 12, 2013 |archive-url = https://web.archive.org/web/20130512202044/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1934/annual_1934_chief.pdf |url-status = dead }}</ref> The new highway between Little Heaven and Bay Road would cross the St. Jones River at a site called Barkers Landing. Between December 1931 and the end of 1933, DSHD constructed a causeway across {{convert|3150|ft|m}} of the marsh on the east bank of the river, a process that required multiple applications of [[fill dirt]] and dynamite to create a stable surface for a modern highway.<ref name="1933 report">{{cite book |title = Annual Report of the State Highway Department of the State of Delaware |edition = 1933 |pages = 27, 40 |publisher = Delaware State Highway Department |location = Dover |date = January 1, 1934 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1933/annual_1933_chief.pdf |access-date = October 22, 2014 |archive-date = May 12, 2013 |archive-url = https://web.archive.org/web/20130512202015/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1933/annual_1933_chief.pdf |url-status = dead }}</ref> A [[bascule bridge|Scherzer rolling lift bascule bridge]] was constructed across the St. Jones River in 1934. Bay Road was widened and the new sections of highway were built with {{convert|20|ft|m|adj=on}} wide concrete pavement starting in 1934.<ref name="1934 report"/> US 113 was relocated to the bypass when the new highway opened for Memorial Day in 1935.<ref name="1935 dshd report">{{cite book |title = Annual Report of the State Highway Department of the State of Delaware |edition = 1935 |page = 28 |publisher = Delaware State Highway Department |location = Dover |date = January 7, 1936 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1935/annual_1935_chief.pdf |access-date = October 22, 2014 |archive-date = May 12, 2013 |archive-url = https://web.archive.org/web/20130512202117/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1935/annual_1935_chief.pdf |url-status = dead }}</ref>
US 113 was widened into a divided highway from north of Milford to south of Frederica and around Dover Air Force Base in 1959.<ref name="DE 1959 map">{{Delaware road map|year=1959|access-date=November 24, 2015}}</ref> A four-lane divided bypass to the east of Frederica was constructed in 1965, with the former alignment of US 113 through Frederica now Frederica Road.<ref name="DE 1965 map">{{Delaware road map|year=1965|access-date=November 24, 2015}}</ref> US 113 between Frederica and Little Heaven was expanded in 1975.<ref name="Milner-18">{{harvp|John Milner Associates|2005|p= 18}}.</ref><ref name="DE 1976 map">{{Delaware road map|year=1976|access-date=November 24, 2015}}</ref> US 113 between Little Heaven and Dover Air Force Base was expanded to a divided highway in 1984 and 1985; this project included replacing the two-lane drawbridge over the St. Jones River with a four-lane girder bridge.<ref name="DE 1985 map">{{Delaware road map|year=1985|access-date=November 24, 2015}}</ref><ref name="NBI St. Jones River">{{NBI|structurenumber=10000002007B008|datakey=91750|access-date=August 22, 2012}}</ref>
[[File:DE 1 SB approaching DE 1A Rehoboth Beach.jpeg|thumb|left|DE 1 southbound approaching DE 1A near Rehoboth Beach]]
What would become DE 1 between Milford and Rehoboth Beach was originally a county road by 1920.<ref name="DE 1920 map">{{Delaware road map|year=1920|access-date=November 24, 2015}}</ref> By 1924, the road was proposed as a state highway between Nassau and Rehoboth Beach.<ref name="DE 1924 map">{{Delaware road map|year=1924|access-date=November 24, 2015}}</ref> A year later, the state highway was completed between Milford and Cedar Creek and from Nassau to just west of Rehoboth Beach, with the sections between Cedar Creek and Nassau and into Rehoboth Beach under proposal.<ref name="DE 1925 map">{{Delaware road map|year=1925|access-date=November 24, 2015}}</ref> In 1927, the state highway between Milford and Rehoboth Beach was completed with the construction of a bascule bridge over the Broadkill River.<ref name="1927 report">{{cite book |title = Annual Report of the State Highway Department |edition = 1927 |page = 7 |publisher = Delaware State Highway Department |location = Dover
When Delaware designated its state highway system by 1936, the state highway between Milford and Bethany Beach became a part of DE 14, which continued west from Milford to the Maryland state line near [[Burrsville, Maryland]].<ref name="DE 1936 map">{{Delaware road map|year=1936|access-date=November 24, 2015}}</ref> In 1939, a southern extension of DE 14 was built between Bethany Beach and the Maryland state line in Fenwick Island as a gravel road.<ref name="1939 report">{{cite book |title = Annual Report of the State Highway Department |edition = 1939 |page = 21 |publisher = Delaware State Highway Department |location = Dover |date = January 1, 1940 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1939/annual_1939_chief.pdf |access-date = October 30, 2014 |archive-date = May 12, 2013 |archive-url = https://web.archive.org/web/20130512202347/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1939/annual_1939_chief.pdf |url-status = dead }}</ref><ref name="DE 1939 map">{{Delaware road map|year=1939|access-date=November 24, 2015}}</ref> In 1940, a [[swing bridge]] opened across the Indian River Inlet.<ref name="1939 report"/><ref name="1940 report">{{cite book |title = Annual Report of the State Highway Department |edition = 1940 |pages = 5, 13 |publisher = Delaware State Highway Department |location = Dover |date = January 1, 1941 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1940/annual_1940_chief.pdf |access-date = October 30, 2014 |archive-date = May 12, 2013 |archive-url = https://web.archive.org/web/20130512202418/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1940/annual_1940_chief.pdf |url-status = dead }}</ref> The same year, work began for a bypass of the route between Dewey Beach and west of Rehoboth Beach, which included a bascule bridge over the Lewes and Rehoboth Canal.<ref name="1940 report"/> In 1942, the Rehoboth Beach bypass for DE 14 was completed.<ref name="1942 report">{{cite book |title = Annual Report of the State Highway Department |edition = 1941-42 |pages = 23 |publisher = Delaware State Highway Department |location = Dover |date = July 1, 1942 |url = https://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1941-42/Chief_Engineers_Report.pdf |access-date = November 17, 2014 |archive-date = January 23, 2019 |archive-url = https://web.archive.org/web/20190123065636/https://deldot.gov/archaeology/historic_pres/annual_reports/pdf/1941-42/Chief_Engineers_Report.pdf |url-status = dead }}</ref><ref name="DE 1942 map"/> In addition, the roadway was paved between Fenwick Island and Bethany Beach by that year.<ref name="DE 1942 map">{{Delaware road map|year=1942|access-date=November 24, 2015}}</ref> In 1952, a new swing bridge opened across the Indian River Inlet after the previous bridge was destroyed by ice and tides in 1948.<ref name=cg102606>{{cite news |last = O'Shea |first = Dennis |title = Replacing Indian River Inlet bridge a vital project |page = 7 |url = https://news.google.com/newspapers?id=U6RkAAAAIBAJ&pg=1750,2583113&dq=indian+river+inlet+bridge&hl=en |date = October 26, 2006 |access-date = April 17, 2012 |work = Cape Gazette }}</ref>
[[File:DE 1 NB from DE 36 overpass.jpeg|thumb|right|DE 1 northbound at the DE 36 interchange in Milford]]
The route was widened into a divided highway between [[Delaware Route 18|DE 18]] (now US 9/DE 404) in Nassau and Rehoboth Beach in 1954 in order to provide relief to traffic heading to the beaches. Channelized intersections were built at DE 18 in Nassau and Rehoboth Avenue in Rehoboth Beach.<ref name="1954 report">{{cite book |title = Report of the State Highway Department |edition = 1954 |page = 12 |publisher = Delaware State Highway Department |location = Dover |date = July 1, 1954 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1954/annual_1954_chief.pdf |access-date = October 31, 2014 |archive-date = September 23, 2015 |archive-url = https://web.archive.org/web/20150923213525/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1954/annual_1954_chief.pdf |url-status = dead }}</ref><ref name="1955 report">{{cite book |title = Report of the State Highway Department |edition = 1955 |page = 21 |publisher = Delaware State Highway Department |location = Dover |date = July 1, 1955 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1955/annual_1955_chief.pdf |access-date = October 31, 2014 |archive-date = September 23, 2015 |archive-url = https://web.archive.org/web/20150923213530/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1955/annual_1955_chief.pdf |url-status = dead }}</ref> As part of this widening, DE 14 was moved to a new alignment to bypass Wescoats Corner, removing a concurrency with DE 18; the bypassed alignment of DE 14 is now US 9 Bus. (which replaced DE 18) and Wescoats Road.<ref name="DE 1954 map">{{Delaware road map|year=1954|access-date=November 24, 2015}}</ref> In 1965, a new dual bridge was constructed across the Indian River Inlet.<ref name="1965 report">{{cite book |title = 1965 Annual Report Delaware State Highway Department |edition = 1965 |page = 22 |publisher = Delaware State Highway Department |location = Dover |date = June 30, 1965 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1965/1965_plan_review.pdf |access-date = October 31, 2014 }}</ref> By 1966, [[Delaware Route 14A|DE 14A]] was designated onto the former alignment of DE 14 through Rehoboth Beach.<ref name="DE 1966 map">{{Delaware road map|year=1966|access-date=November 24, 2015}}</ref> The divided highway portion of DE 14 was extended north from DE 18 to DE 16, which included a bypass of Nassau, and between the Indian River Inlet and South Bethany in 1967. The former alignment of DE 14 through Nassau is now Nassau Road.<ref name="1967 report">{{cite book |title = 1967 Annual Report Delaware State Highway Department |edition = 1967 |page = 11 |publisher = Delaware State Highway Department |location = Dover |date = June 30, 1967 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1967/div_rpts.pdf |access-date = October 31, 2014 }}</ref><ref name="DE 1967 map">{{Delaware road map|year=1967|access-date=November 24, 2015}}</ref> By 1967, a divided bypass of Milford running from DE 14 southeast of Milford to US 113 north of Milford was under proposal.<ref name="DE 1967 map"/> Structural design on the Milford Bypass began in 1968.<ref name="1968 report">{{cite book |title = Annual Report 1968 |edition = 1968 |page = 18 |publisher = Delaware State Highway Department |location = Dover |date = June 30, 1968 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1968/div_rpts.pdf |access-date = October 31, 2014 |archive-date = September 23, 2015 |archive-url = https://web.archive.org/web/20150923213622/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1968/div_rpts.pdf |url-status = dead }}</ref> In 1969, design work began on widening DE 14 into a divided highway between DE 16 and the Milford Bypass.<ref name="1969 report">{{cite book |title = Annual Report 1969 |edition = 1969 |page = 18 |publisher = Delaware State Highway Department |location = Dover |date = June 30, 1969 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1969/1969_bridge_thru_dgn.pdf |access-date = October 31, 2014 }}</ref> The route was widened into a divided highway between Dewey Beach and the Indian River Inlet the same year.<ref name="DE 1969 map">{{Delaware road map|year=1969|access-date=November 24, 2015}}</ref><ref name="1970 report">{{cite book |title = Delaware State Highway Department Annual Report 1970 |edition = 1970 |page = 15 |publisher = Delaware State Highway Department |location = Dover |date = June 30, 1970 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1970/1970_plan_mr_dc.pdf |access-date = October 31, 2014 |archive-date = February 11, 2017 |archive-url = https://web.archive.org/web/20170211164856/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1970/1970_plan_mr_dc.pdf |url-status = dead }}</ref> In 1971, the divided Miford Bypass between DE 14 southeast of Milford and US 113 north of Milford was completed.<ref name="DE 1971 map">{{Delaware road map|year=1971|access-date=November 24, 2015}}</ref><ref name="1972 report">{{cite book |title = Annual Report 1972 |edition = 1972 |page = 18 |publisher = Delaware Department of Highways and Transportation |location = Dover |date = October 15, 1972 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1972/1972_rpt.pdf |access-date = October 31, 2014 |archive-date = February 17, 2017 |archive-url = https://web.archive.org/web/20170217094527/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1972/1972_rpt.pdf |url-status = dead }}</ref> In 1971, a contract was awarded to widen DE 14 to a divided highway between Fenwick Island and South Bethany.<ref name="1971 report">{{cite book |title = Annual Report 1971 |edition = 1971 |page = 6 |publisher = Delaware Department of Highways and Transportation |location = Dover |date = November 15, 1971 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1971/1971_rpt.pdf |access-date = October 31, 2014 |archive-date = September 10, 2012 |archive-url = https://web.archive.org/web/20120910211448/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1971/1971_rpt.pdf |url-status = dead }}</ref> This widening project was completed a year later.<ref name="1972 report"/> In 1973, construction was underway to make DE 14 a divided highway from the Milford Bypass to DE 16, which included a bypass of Argos Corner; this was completed in 1974. The former alignment of DE 14 through Argos Corner is now Argos Corner Road.<ref name="DE 1973 map">{{Delaware road map|year=1973|access-date=November 24, 2015}}</ref>
In 1974, DE 1 was signed concurrent with DE 14 east of Milford and on the Milford Bypass.<ref name="MD 1974 map">{{Maryland road map|year=1974}}</ref> Work began in 1975 to widen the portion of DE 14 bypassing Rehoboth Beach, which included a new bridge over the Lewes and Rehoboth Canal.<ref name="1975 report">{{cite book |title = Annual Report 1975 |edition = 1975 |page = 14 |publisher = Delaware Department of Highways and Transportation |location = Dover |date = 1975 |url = http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1975/1975_rpt.pdf |access-date = October 31, 2014 |archive-date = February 17, 2017 |archive-url = https://web.archive.org/web/20170217094645/http://www.deldot.gov/archaeology/historic_pres/annual_reports/pdf/1975/1975_rpt.pdf |url-status = dead }}</ref> In 1977, DE 14 was truncated to Milford, with DE 1 replacing the route between Fenwick Island and the south end of the Milford Bypass.<ref name="MD 1977 map">{{Maryland road map|year=1977}}</ref><ref name="DE 1981 map">{{Delaware road map|year=1981|access-date=November 24, 2015}}</ref> As a result of this, DE 14A was renumbered to DE 1A.<ref name="DE 1981 map"/> A new high-level bridge carrying DE 1 over the Lewes and Rehoboth Canal opened in 1978.<ref name="NBI 1978">{{NBI|structurenumber=3150S014|datakey=92657|access-date=October 31, 2014}}</ref> By 1981, DE 1 was widened to a divided highway between Dewey Beach and southwest of Rehoboth Beach except for the crossing of the canal.<ref name="DE 1981 map"/> In 1985, the crossing over the Lewes and Rehoboth Canal was dualized with a high-level bridge constructed for northbound traffic.<ref name="NBI 1985">{{NBI|structurenumber=3150N014|datakey=92656|access-date=October 31, 2014}}</ref> DE 1 was designated along US 113 between Milford and Dover in 1988.<ref name="DE 1988 map"/> In 1991, DelDOT enacted corridor preservation measures on DE 1, including its concurrency with US 113, from Dover Air Force Base to Nassau to prevent excessive development along the corridor so it can gradually be transformed into a freeway.<ref name="On the Road 7">{{cite news |title = SR-1 Corridor-Preservation Project |page = 1 |work = On the Road |issue = 1 |date = Summer 1991 |publisher = Delaware Department of Transportation |location = Dover |url = http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-7.pdf |archive-url = https://web.archive.org/web/20060925084928/http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-7.pdf |archive-date = September 25, 2006 |access-date = April 4, 2017 |url-status = dead }}</ref> The same year, a jughandle was built between eastbound US 9/DE 404 and northbound DE 1 as part of an reconfiguration of the Five Points intersection that separated the DE 23 and Plantation Road intersection from US 9/DE 404.<ref name=fivepoints/>
In 2004, the concurrent US 113 designation along DE 1 between Milford and Dover Air Force Base was removed.<ref name="AASHTO US 113">{{AASHTO minutes |year=2003A |access-date=April 15, 2010}}</ref><ref name="DE 2006 map">{{Delaware road map|year=2006|access-date=November 24, 2015}}</ref> Between September 2003 and May 2004, a $5 million improvement project took place on DE 1 between Dewey Beach and the Lewes and Rehoboth Canal bridge that added sidewalks on both sides of the road, median modifications, improvements to pavement, drainage, and intersections, and installed new pedestrian and traffic signals.<ref>{{cite web |title = SR1 Sidewalks, Dewey Beach to Canal, Improvements |publisher = Delaware Department of Transportation |url = http://deldot.net:80/static/projects/sr1_sidewalks_dewey_canal/ |access-date = February 19, 2018 |archive-url = https://web.archive.org/web/20060129224849/http://deldot.net/static/projects/sr1_sidewalks_dewey_canal/ |archive-date = January 29, 2006 |url-status = dead |df = mdy-all }}</ref> In 2004, DelDOT began a study on converting the Five Points intersection into an interchange in addition to constructing the Western Parkway.<ref name=fivepoints/> The Western Parkway would have provided a road corridor from DE 1 north of Five Points south to DE 24, running to the west of DE 1. The parkway, which was intended to provide another north-south corridor in the area, was planned to have [[limited-access road|partial control of access]], featuring intersections with existing roads but no private driveways or access to new development.<ref>{{cite web |title = Western Parkway Project Contract # 25-125-01 |publisher = Delaware Department of Transportation |url = http://deldot.gov:80/static/projects/western_parkway/ |access-date = February 24, 2018 |archive-url = https://web.archive.org/web/20070807160902/http://deldot.gov/static/projects/western_parkway/ |archive-date = August 7, 2007 |url-status = dead |df = mdy-all }}</ref> Alternatives for these projects were presented at public workshops between 2004 and 2008, although the projects were cancelled due to lack of support and financial limitations.<ref name=fivepoints/> On September 11, 2006, work began on a $9.7 million project to widen DE 1 between DE 24 in Midway and US 9/DE 404 in Five Points by adding a third southbound lane and a multi-use lane in both directions. The project was completed on June 9, 2008.<ref>{{cite press release |title = Traffic Alert - Route 1 Expansion Project Complete |publisher = Delaware Department of Transportation |date = June 9, 2008 |url = http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3049 |access-date = October 25, 2014 }}</ref>
[[File:2022-07-14 16 58 44 View south along Delaware State Route 1 (Coastal Highway) just north of Delaware State Route 26 (Garfield Parkway) in Bethany Beach, Sussex County, Delaware.jpg|thumb|left|DE 1 southbound approaching DE 26 in Bethany Beach]]
In 2009, work began to replace the steel-girder Indian River Inlet Bridge with a cable-stayed span due to [[Bridge scour|scouring]] that had occurred to the steel girder bridge.<ref name=cg8907>{{cite news |last = MacArthur |first = Ron |title = DelDOT officials say inlet bridge is safe |page = 1 |url = https://news.google.com/newspapers?id=fG8zAAAAIBAJ&pg=1561,4663089&dq=indian+river+inlet+bridge&hl=en |date = August 9, 2007 |access-date = April 17, 2012 |work = Cape Gazette }}</ref><ref name=deldot73009>{{cite web |url = http://www.deldot.gov/information/projects/indian_river_bridge/pdf/IRIB_update_July2009.pdf |title = Massive Nighttime Concrete Pour Planned For New Indian River Inlet Bridge |date = July 30, 2009 |publisher = Delaware Department of Transportation |access-date = April 17, 2012 }}</ref> The new Indian River Inlet Bridge opened to southbound traffic on January 20, 2012. Delaware Governor [[Jack Markell]], U.S. Senator [[Tom Carper]], and DelDOT Secretary [[Shailen Bhatt]] rode in the first car across the bridge.<ref name=de12012>{{cite web |url = http://news.delaware.gov/2012/01/20/indian-river-inlet-bridge-open-to-traffic/ |title = Indian River Inlet Bridge Open to Traffic |publisher = State of Delaware |date = January 20, 2012 |access-date = April 17, 2012 }}</ref> On January 30, 2012, one northbound lane of the new bridge opened.<ref name=de12012/><ref name=deldotirib>{{cite web |url = http://www.deldot.gov/information/projects/indian_river_bridge/index.shtml |title = Indian River Inlet Bridge |publisher = Delaware Department of Transportation |access-date = April 17, 2012 }}</ref> All four lanes of the bridge as well as the pedestrian and bicycle walkway opened in early 2012.<ref name=de12012/> Demolition of the former bridge began in early 2012 and was completed in early 2013.<ref name=deldotirib/>
In September 2014, a $7.2 million project began for pedestrian improvements along the stretch of DE 1 between the bridge over the Lewes and Rehoboth Canal in Rehoboth Beach and Nassau, which sees heavy pedestrian and bicycle traffic during the summer months. The project added a continuous sidewalk along this segment of road, multiple new crosswalks, and new and improved bus stops. The pedestrian improvement project was completed on June 13, 2016, with Governor Markell, DelDOT secretary Jennifer Cohan, State Representative [[Peter Schwartzkopf]], and State Senator [[Ernesto Lopez]] in attendance at a ceremony to mark the completion of the project.<ref>{{cite press release |title = Pedestrian Improvements to Route 1 (Coastal Highway) Completed |publisher = Delaware Department of Transportation |date = June 13, 2016 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=6092 |access-date = June 14, 2016 }}</ref>
DelDOT has replaced several at-grade intersections along DE 1 south of Dover with grade-separated interchanges in order to improve traffic flow and safety, particularly in the summer months when the route sees heavy beach traffic.<ref>{{cite news |last = Brown |first = Jeff |title = Work on Little Heaven intersection to start in October |work = Dover Post |date = September 9, 2015 |url = http://www.doverpost.com/article/20150909/NEWS/150909824 |access-date = December 20, 2016 }}</ref> On October 27, 2008, construction began on an interchange at DE 9 near Dover Air Force Base, with Governor [[Ruth Ann Minner]] in attendance at the groundbreaking ceremony.<ref>{{cite press release |title = Route 1 and Route 9 Overpass Groundbreaking Event |publisher = Delaware Department of Transportation |date = October 27, 2008 |url = https://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3201 |access-date = December 20, 2017 }}</ref> Construction of the interchange at DE 9 was completed in 2009.<ref name=DelDOT2009>{{cite press release |url = http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3478 |title = Traffic Alert - Route 1 & Route 9 Overpass Project Will Require Closure of Route 9 & Kitts Hummock Road |date = September 14, 2009 |publisher = Delaware Department of Transportation |access-date = February 8, 2011 }}</ref> In November 2009, construction began for a grade-separated interchange with DE 12 in Frederica; the interchange was completed in June 2011.<ref name=deldot>{{cite press release |url = http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3556&month=11&year=2009 |title = Construction to begin for Route 1, North Frederica Grade Separated Intersection |date = November 23, 2009 |publisher = Delaware Department of Transportation |access-date = December 29, 2009 }}</ref><ref name=deldot2011>{{cite press release |url = http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=4023&month=6&year=2011 |title = Traffic Alert: Opening of Route 1, North Frederica Overpass |date = June 24, 2011 |publisher = Delaware Department of Transportation |access-date = July 8, 2011 }}</ref> In September 2011, the median crossover at the Wilkins Road intersection near the northern terminus of DE 30 was permanently closed ahead of a project to construct an interchange with DE 30. The median crossover at [[Delaware Route 30 Alternate|DE 30 Alt.]] (Johnson Road) was modified to prohibit left turns from northbound DE 30 Alt. to northbound DE 1; only allowing motorists to turn from northbound DE 30 Alt. to southbound DE 1 and to access southbound DE 30 Alt. from both directions of DE 1.<ref>{{cite press release |title = Route 1 and 30/Wilkins Road Intersection To Close |publisher = Delaware Department of Transportation |date = September 6, 2011 |url = https://deldot.gov/public.ejs?command=PublicNewsDisplay&id=4101 |access-date = March 29, 2018 }}</ref> In November 2012, construction began on the interchange at DE 30 southeast of Milford, which was completed in July 2014.<ref>{{cite press release |title = Routes 1 and 30 Grade Separated Intersection Completed |publisher = Delaware Department of Transportation |date = July 25, 2014 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=5223 |access-date = August 4, 2014 }}</ref> On January 31, 2015, groundbreaking took place for an interchange at Thompsonville Road north of Milford, with Governor Markell and DelDOT secretary Bhatt in attendance.<ref>{{cite web |title = State Route 1, Thompsonville Grade Separated Intersection |url = http://www.deldot.gov/information/projects/sr1/thompsonville/ |publisher = Delaware Department of Transportation |access-date = March 24, 2012 }}</ref><ref>{{cite news |last = Anderson |first = Logan B. |title = DelDOT breaks ground on new Thompsonville Road Interchange |work = Delaware State News |location = Dover |date = February 1, 2015 |url = http://delaware.newszap.com/centraldelaware/138019-70/deldot-breaks-ground-on-new-thompsonville-road-interchange |access-date = July 27, 2015 |url-status = dead |archive-url = https://web.archive.org/web/20151018041427/http://delaware.newszap.com/centraldelaware/138019-70/deldot-breaks-ground-on-new-thompsonville-road-interchange |archive-date = October 18, 2015 |df = mdy }}</ref> Construction of this interchange involved extending Thompsonville Road west from DE 1 to an intersection with Church Hill Road and Tub Mill Pond Road. The interchange at Thompsonville Road opened in November 2016.<ref>{{cite press release |title = SR 1 Thompsonville Grade Separated Intersection - Open to Traffic |url = http://www.deldot.gov/home/newsroom/release.shtml?id=6315 |publisher = Delaware Department of Transportation |date = November 10, 2016 |access-date = November 10, 2016 }}</ref>
On November 9, 2015, construction began on an interchange at Bowers Beach Road and Clapham Road in Little Heaven, with Governor Markell, DelDOT secretary Cohan, U.S. Senators Carper and [[Chris Coons]], and Speaker of the Delaware House of Representatives Peter Schwartzkopf in attendance at the groundbreaking ceremony. Work on the interchange at Bowers Beach Road and Clapham Road built service roads on both sides of the route with a bridge carrying DE 1 over Bowers Beach Road.<ref>{{cite press release |title = DelDOT Breaks Ground On Little Heaven Grade Separated Intersection |publisher = Delaware Department of Transportation |date = November 9, 2015 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=5793 |access-date = November 15, 2015 }}</ref><ref name=littleheaven>{{cite web |title = State Route 1, Little Heaven Grade Separated Intersection |url = http://www.deldot.gov/information/projects/sr1/little_heaven/ |publisher = Delaware Department of Transportation |access-date = March 24, 2012 }}</ref><ref>{{cite news |last = Lehman |first = Tom |title = Little Heaven Intersection Set to Finish Construction Next Year |publisher = WBOC-TV |location = Salisbury, MD |date = November 28, 2018 |url = http://www.wboc.com/story/39548701/little-heaven-intersection-set-to-finish-construction-next-year |access-date = November 28, 2018 }}</ref> On December 20, 2017, the ramps connecting southbound DE 1 and Clapham Road opened.<ref>{{cite press release |title = Traffic Alert - SR 1, Little Heaven Grade Separated Intersection Project -- New Traffic Pattern on SR 1 SB |publisher = Delaware Department of Transportation |date = December 19, 2017 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=6917 |access-date = December 20, 2017 }}</ref> The east service road, called Little Heaven Road, was opened on February 27, 2018, and served as the temporary northbound lanes of DE 1 while the bridges over Bowers Beach Road were being built.<ref name=littleheaven/><ref>{{cite press release |title = Traffic Alert - Traffic Switch Will Require Weekday Lane Closure on Route 1 |publisher = Delaware Department of Transportation |date = February 21, 2018 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=6983 |access-date = February 27, 2018 }}</ref> The new alignment carrying DE 1 over Bowers Beach Road opened to traffic on March 4, 2019; at the same time, access to Bowers Beach Road and Clapham Road transitioned to the ramps and service roads.<ref>{{cite press release |title = Traffic Alert - Update: Route 1 - New Traffic Pattern in Little Heaven |publisher = Delaware Department of Transportation |date = March 1, 2019 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=7517 |access-date = March 1, 2019 }}</ref><ref>{{cite news |last = Lehman |first = Tom |title = Little Heaven Intersection on Route 1 Makes Kent County Travel Easier |publisher = WBOC-TV |location = Salisbury, MD |date = March 4, 2019 |url = http://www.wboc.com/story/40066925/little-heaven-intersection-on-route-1-makes-kent-county-travel-easier |access-date = March 4, 2019 |archive-date = March 5, 2019 |archive-url = https://web.archive.org/web/20190305144926/http://www.wboc.com/story/40066925/little-heaven-intersection-on-route-1-makes-kent-county-travel-easier |url-status = dead }}</ref> Two-way traffic was implemented on the Old Beach Road service road to the west on June 14, 2019, and on the Little Heaven Road service road to the east on July 12, 2019.<ref>{{cite press release |title = Traffic Alert - New Traffic Pattern - Little Heaven |publisher = Delaware Department of Transportation |date = June 10, 2019 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=7674 |access-date = June 10, 2019 }}</ref> The Little Heaven interchange project cost $44 million and eliminated the last traffic signals along DE 1 in Kent County. A ribbon-cutting ceremony for the interchange took place on August 13, 2019, with Governor [[John Carney (Delaware politician)|John Carney]], Lieutenant Governor [[Bethany Hall-Long]], members of the [[Delaware General Assembly]], and DelDOT secretary Cohan in attendance.<ref>{{cite press release |title = Ribbon cut on Little Heaven intersection project |publisher = Delaware Department of Transportation |date = August 13, 2019 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=7752&type=News |access-date = August 13, 2019 }}</ref>
[[File:DE 1 NB past DE 12.jpeg|thumb|right|DE 1 northbound past DE 12 near Frederica]]
On March 18, 2016, a groundbreaking ceremony took place to build an interchange at Frederica Road south of Frederica, with Governor Markell, Senator Carper, and Kent County Administrator Michael J. Petit de Mange present at the ceremony.<ref>{{cite news |last = Finney |first = Mike |title = State officials break ground in South Frederica: Overpass seen as key to area's growth, safety |work = Dover Post |date = March 20, 2016 |url = http://www.doverpost.com/article/20160318/NEWS/160319758 |access-date = June 8, 2016 }}</ref><ref>{{cite web |title = State Route 1, South Frederica Grade Separated Intersection |url = http://www.deldot.gov/information/projects/sr1/sr1_frederica/ |publisher = Delaware Department of Transportation |access-date = March 24, 2012 }}</ref> The Frederica Road interchange south of Frederica opened to traffic on July 10, 2018.<ref>{{cite press release |title = South Frederica GSI to open on Tuesday |publisher = Delaware Department of Transportation |date = July 9, 2018 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=7215 |access-date = July 9, 2018 }}</ref><ref>{{cite news |last = Lehman |first = Tom |title = South Frederica Interchange Opens in Kent County |publisher = WBOC-TV |location = Salisbury, MD |date = July 10, 2018 |url = http://www.wboc.com/story/38614537/south-frederica-interchange-opens-in-kent-county |access-date = July 10, 2018 }}</ref> A ribbon-cutting ceremony for this interchange was held on August 10, 2018, with Governor Carney, Senator Carper, U.S. Representative [[Lisa Blunt Rochester]], and DelDOT secretary Cohan in attendance.<ref>{{cite press release |title = Ribbon cut on South Frederica Grade-Separated Intersection |publisher = Delaware Department of Transportation |date = August 10, 2018 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=7275 |access-date = August 10, 2018 }}</ref> On March 26, 2018, a groundbreaking ceremony was held to construct an interchange at DE 14 in Milford; Governor Carney, Senator Carper, U.S. Representative Blunt Rochester, and DelDOT secretary Cohan attended the ceremony.<ref>{{cite press release |title = Governor Carney and Officials Break Ground on New Milford Interchange |publisher = State of Delaware |date = March 26, 2018 |url = https://news.delaware.gov/2018/03/26/governor-carney-officials-break-ground-new-milford-interchange/ |access-date = March 26, 2018 }}</ref> Construction of the interchange at DE 14 in Milford eliminated the at-grade intersections with DE 14 and Northeast 10th Street and also built a connector road from DE 14 to Northeast 10th Street.<ref>{{cite web |title = SR1, Northeast Front Street Grade Separated Intersection Construction Phasing |publisher = Delaware Department of Transportation |url = https://deldot.gov/information/projects/sr1/sr1_northeast_front_st/pdf/NEFrontStPhasing.pdf |access-date = February 23, 2018 }}</ref> A ribbon-cutting ceremony for the DE 14 interchange took place on May 18, 2019, with DelDOT secretary Cohan, Senator Carper, and State Representative [[Bryan Shupe]] in attendance.<ref>{{cite press release |title = Ribbon to be Cut on North East Front Street Intersection |publisher = Delaware Department of Transportation |date = May 17, 2019 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=7644 |access-date = May 17, 2019 }}</ref>
On June 21, 2022, a groundbreaking ceremony was held to mark the beginning of construction of an interchange with DE 16 east of Milton, with Governor Carney, DelDOT secretary Nicole Majeski, and state and local officials in attendance.<ref name=cape62122>{{cite news |last = Roth |first = Nick |title = Overpass project at Route 1 and Route 16 is underway |work = Cape Gazette |date = June 21, 2022 |url = https://www.capegazette.com/article/overpass-project-route-1-and-route-16-underway/241984 |access-date = June 21, 2022 }}</ref> On May 31, 2023, northbound DE 1 traffic was shifted to the completed northbound ramps to allow for construction of the grade separation.<ref>{{cite press release |title = Traffic Alert - Sussex County - New Route 1 Northbound Travel Pattern at Route 16 Begins Next Week |publisher = Delaware Department of Transportation |date = May 24, 2023 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=9545&type=Traffic |access-date = May 24, 2023 }}</ref> Traffic along southbound DE 1 was temporarily shifted to the former northbound lanes on July 19, 2023, in order for the grade separation and southbound ramps to be constructed.<ref>{{cite press release |title = Traffic Alert - Sussex County - New Traffic Pattern at SR 1 and SR 16 |publisher = Delaware Department of Transportation |date = June 27, 2023 |url = https://www.deldot.gov/About/news/index.shtml?dc=release&id=9611 |access-date = July 10, 2023 }}</ref> Construction of the interchange at DE 16 is planned to be completed in the later part of 2025.<ref name=cape62122/><ref name=route16interchange>{{cite web |title = HEP Sussex County, SR 1 and SR 16 Grade Separated Intersection |publisher = Delaware Department of Transportation |url = https://deldot.gov/projects/index.shtml?dc=details&projectNumber=T201500301 |access-date = July 9, 2019 }}</ref>
There are plans to replace two more at-grade intersections along the route with grade-separated interchanges. The two intersections to be upgraded to interchanges are Cave Neck Road in Overbrook<ref name=cape62419>{{cite news |last = Roth |first = Nick |title = Lewes: DelDOT should reconsider order of Route 1 improvements |work = Cape Gazette |date = June 24, 2019 |url = https://www.capegazette.com/article/lewes-deldot-should-reconsider-order-route-1-improvements/183144 |access-date = July 9, 2019 }}</ref> and Minos Conaway Road in Nassau.<ref name=minosconawayinterchange/> Construction of the interchange at Cave Neck Road is planned to start in 2026 and be finished in 2028.<ref>{{cite news |last = MacArthur |first = Ron |title = DelDOT selects design for Route 1 overpass at Cave Neck Road |work = Cape Gazette |date = May 18, 2020 |url = https://www.capegazette.com/article/deldot-selects-design-route-1-overpass-cave-neck-road/201993 |access-date = May 22, 2020 }}</ref><ref>{{cite web |title = SR 1 and Cave Neck Road Grade Separated Intersection |publisher = Delaware Department of Transportation |url = https://deldot.gov/projects/index.shtml?dc=details&projectNumber=T201912201 |access-date = February 21, 2024 }}</ref> In August 2019, the median crossover at Cave Neck Road was modified to prohibit left turns from Cave Neck Road to northbound DE 1 along with U-turns from southbound DE 1; only allowing motorists to turn from Cave Neck Road to southbound DE 1 and to access Cave Neck Road from both directions of DE 1.<ref name=cape9619>{{cite news |last = MacArthur |first = Ron |title = DelDOT updates schedule on Route 1 crossover work |work = Cape Gazette |date = September 6, 2019 |url = https://www.capegazette.com/article/deldot-updates-schedule-route-1-crossover-work/188057 |access-date = September 10, 2019 }}</ref> The interchange at Minos Conaway Road is currently in the design and planning stage, with construction beginning in 2024 and ending in 2027.<ref name=minosconawayinterchange>{{cite web |title = SR 1, Minos Conaway Road Grade Separated Intersection |publisher = Delaware Department of Transportation |url = https://deldot.gov/projects/index.shtml?dc=details&projectNumber=T201612501 |access-date = July 9, 2019 }}</ref> As part of constructing the interchange at Minos Conaway Road, nine median crossovers will be eliminated along DE 1 and traffic will be directed to the interchange.<ref name=cape10819>{{cite news |last = Roth |first = Nick |title = DelDOT proposes major changes near Nassau Bridge |work = Cape Gazette |date = October 8, 2019 |url = https://www.capegazette.com/article/deldot-proposes-major-changes-near-nassau-bridge/190043 |access-date = October 8, 2019 }}</ref> There were also plans to modify the median crossovers at Oyster Rocks Road, Hudson Road, and DE 5 by restricting turning movements, with modifications completed in 2020.<ref name=cape9619/><ref>{{cite press release |title = Traffic Alert - Reconstruction of Island and Traffic Pattern Change at Route 1 NB/SB-Sussex County |publisher = Delaware Department of Transportation |date = April 6, 2020 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=8056&type=Traffic |access-date = April 10, 2020 }}</ref>
In 2021, plans were made to construct a median fence along DE 1 between Read Avenue and Saulsbury Street in Dewey Beach, which is aimed to direct pedestrians to cross the roadway at crosswalks.<ref>{{cite news |last = Driscoll |first = Ellen |title = Public safety projects continue in Dewey Beach |work = Cape Gazette |date = November 12, 2021 |url = https://www.capegazette.com/article/public-safety-projects-continue-dewey-beach/230427 |access-date = February 15, 2022 }}</ref> The median fence was constructed in 2022. This section of fence is a pilot project and the fencing could be extended along the entire length of DE 1 in Dewey Beach in the future.<ref>{{cite news |last = Lytle |first = Emily |title = What are those new posts doing in the median at Dewey Beach? We've got the answers |work = The News Journal |location = Wilmington, DE |date = February 15, 2022 |url = https://www.delawareonline.com/story/news/local/2022/02/15/dewey-beach-installing-new-barrier-median-pedestrian-safety/6750162001/ |access-date = February 15, 2022 }}</ref> In early 2024, construction began on a median cable barrier along DE 1 between DE 30 in Milford and Trap Shooters Road near Magnolia in order to prevent crossover crashes; construction is planned to be finished in early 2025. In the future, the median cable barrier will be extended further south along DE 1.<ref>{{cite news|last=Rothstein|first=Benjamin|title=Delaware Transportation Department details Del. 1 median barrier installation|work=Daily State News|date=July 3, 2024|url= https://baytobaynews.com/stories/deldot-details-route-1-median-barrier-installation,139341|access-date=July 5, 2024}}</ref>
A direct ramp from southbound DE 1 to US 9/DE 404 at the DE 1D/DE 23 intersection was constructed as part of a reconfiguration of the intersection between US 9/DE 404 and DE 1D/DE 23. The ramp opened on May 16, 2024.<ref name=fivepoints>{{cite web|title=Plantation Road Workshop Display|publisher=Delaware Department of Transportation|date=February 15, 2018|url=https://deldot.gov/information/projects/PlantationRd/workshop/Plantation%20Road%20workshop%20materials%202018-02-15.pdf|access-date=February 24, 2018}}</ref><ref name=plantation>{{cite web|title=Project: Plantation Road Improvements, Robinsonville Road to US 9 (Phase 1)|publisher=Delaware Department of Transportation|url=https://deldot.gov/projects/index.shtml?dc=details&projectNumber=T202011201#project-details1|access-date=March 30, 2023}}</ref><ref name=wboc51624/>
===Korean War Veterans Memorial Highway===
[[File:2022-07-17 16 37 07 View north along Delaware State Route 1 (Korean War Veterans Memorial Highway) just north of Exit 114 in Smyrna, Kent County, Delaware.jpg|thumb|right|DE 1 northbound past the US 13 interchange in the southern part of Smyrna]]
Between 1958 and 1971, studies were conducted for a bypass of the segment of US 13 through Dover along with a connector between Dover and Frederica.<ref name=SR1timeline/> The proposed routing began at US 113 and DE 12 north of Frederica and continued northwest to [[Woodside, Delaware|Woodside]], where it was planned to cross US 13. From here, the bypass was to run to the west of Dover and head north to its terminus at US 13 north of Cheswold.<ref>{{cite map |title = City of Dover Kent & Sussex Counties, DE. |publisher = Franklin Maps }}</ref> As part of planning of the Dover Bypass, an archaeological survey had to be conducted along part of the proposed route between 1972 and 1975. By 1976, construction of the Dover Bypass was postponed indefinitely.<ref>{{cite report |author1 = Griffith, Daniel R. |author2 = Artusy Jr., Richard E. |title = An Assessment of the Prehistoric Archaeological Resources of the Proposed Dover Bypass Corridor, Frederica to Route 100, Kent County, Delaware |publisher = Delaware Department of State |date = January 26, 1976 |url = http://www.deldot.gov/archaeology/dover_bypass/pdf/deldot_series_7_cover.pdf |access-date = October 17, 2014 |archive-date = September 23, 2015 |archive-url = https://web.archive.org/web/20150923213355/http://www.deldot.gov/archaeology/dover_bypass/pdf/deldot_series_7_cover.pdf |url-status = dead }}</ref> From 1971 to 1978, a north-south extension of the Delaware Turnpike (I-95) between Wilmington and Dover was studied.<ref name=SR1timeline/> This extension was proposed to run from north of I-95 in [[Ogletown, Delaware|Ogletown]] south to US 13 near [[Camden, Delaware|Camden]]. The toll road would head south from Ogletown and cross the Chesapeake & Delaware Canal on the [[Summit Bridge]] to reach a connector to US 301 near the Maryland state line. From here, the turnpike would bypass Middletown, [[Clayton, Delaware|Clayton]], Smyrna, and Dover to the west before coming to US 13. Intermediate interchanges were to be located west of Dover, at DE 6 west of Smyrna, west of Middletown, at DE 896 south of the Summit Bridge, DE 71 north of the Summit Bridge, US 40, and I-95. The north-south extension of the Delaware Turnpike was to have a combination of ramp tolls and mainline toll barriers. Three mainline toll barriers were to be located between I-95 and US 40, between Middletown and Smyrna, and north of Camden. The projected cost of the project in 1972 was $107 million.<ref name=mn32972>{{cite news |last = Moore |first = Jim |title = Ogletown-Dover high speed toll highway backed |work = The Morning News |location = Wilmington, DE |date = March 29, 1972 |page = 1 }}</ref>
In 1983, studies began for a "Relief Route" of US 13 between Dover and Wilmington.<ref name=SR1timeline/> The new highway was proposed in order to relieve US 13 of traffic heading to the Delaware Beaches in the summer.<ref name=inq21286>{{cite news |last = Carper |first = Alison |title = New Route To Be Built For Del. Beach Traffic |work = The Philadelphia Inquirer |date = February 12, 1986 |url = http://articles.philly.com/1986-02-12/news/26087993_1_fourth-bridge-new-route-transportation-officials |archive-url = https://web.archive.org/web/20141104150533/http://articles.philly.com/1986-02-12/news/26087993_1_fourth-bridge-new-route-transportation-officials |url-status = dead |archive-date = November 4, 2014 |access-date = October 19, 2014 }}</ref> The Relief Route for US 13 was planned as a toll road in order to help pay for the cost of the construction of the highway.<ref name=dsn12885>{{cite news |last = Beneke |first = Dale |title = Toll-road option entices planners |work = Delaware State News |location = Dover |date = December 8, 1985 }}</ref> Prior to the beginning of construction, an archaeological survey was conducted along the proposed route of the freeway in 1986.<ref>{{cite report |author1 = Benenson, Carol A. |author2 = Bower, Mark A. |title = Architectural Investigation U.S. Route 13 Relief Route, Route 7 to U.S. Route 113, New Castle and Kent Counties, Delaware |publisher = Federal Highway Administration and Delaware Department of Transportation |date = 1987 |url = https://www.deldot.gov/archaeology/us13/pdf/series55/intro.pdf |access-date = October 17, 2014 |archive-date = March 4, 2016 |archive-url = https://web.archive.org/web/20160304055119/https://www.deldot.gov/archaeology/us13/pdf/series55/intro.pdf |url-status = dead }}</ref> The same year, plans were unveiled for the route, which would begin at US 113 south of Dover and head north to US 13 in Tybouts Corner. The Relief Route would cross US 13 several times, passing to the east of Dover and Smyrna and to the west of Odessa.<ref name=inq21286/> The section of DE 1 between Tybouts Corner and Christiana had originally been planned as a relief route for DE 7, a two-lane road connecting US 13 to I-95 that saw a lot of congestion.<ref>{{cite web |url = http://www.deldot.org/static/projects/sr1/1st.html |title = State Route 1 Tybouts Corner to I-95 / Christiana Mall Overview |publisher = Delaware Department of Transportation |access-date = October 19, 2014 |archive-url = https://web.archive.org/web/20031024191905/http://www.deldot.org/static/projects/sr1/1st.html |archive-date = October 24, 2003 }}</ref>
In
In April 1992, groundbreaking took place for the section of DE 1 between St. Georges and Tybouts Corner.<ref name=SR1timeline/> It was decided that the highway would cross the Chesapeake & Delaware Canal on a cable-stayed bridge.<ref>{{cite news |title = New C&D Canal Bridge |work = On the Road |publisher = Delaware Department of Transportation |issue = 5 |date = Fall 1990 |page = 2 |url = http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-5.pdf |access-date = October 18, 2014 |url-status = dead |archive-url = https://web.archive.org/web/20050211062033/http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-5.pdf |archive-date = February 11, 2005 }}</ref> The section of DE 1 between DE 273 and I-95 in Christiana opened in April 1993.<ref name=SR1timeline/> In August of that year, southbound DE 1 between US 113 at Lafferty Lane in Dover and US 113 south of DE 10 at Dover Air Force Base was opened to traffic. In September 1993, bicyclists were allowed on a section of the under-construction DE 1. The portion of the route bypassing Smyrna was finished in November of that year.<ref>{{cite news |title = Progress on SR 1 Moves Forward |work = On the Road |publisher = Delaware Department of Transportation |issue = 14 |date = Fall 1993 |page = 1 |url = http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-14.pdf |access-date = November 30, 2016 |url-status = dead |archive-url = https://web.archive.org/web/20060929170629/http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-14.pdf |archive-date = September 29, 2006 }}</ref> The section of the tollway between US 113 at Dover Air Force Base and US 13 south of Smyrna opened on December 21, 1993, with Governor Tom Carper in attendance at the opening ceremony. This section opened with a mainline toll barrier and ramp tolls.<ref name=dsn122293>{{cite news |author = Staff |title = People - Features |work = Delaware State News |location = Dover |date = December 22, 1993 }}</ref><ref name="DE 1994 map">{{Delaware road map|year=1994|access-date=November 24, 2015}}</ref> Following the completion of this section, DE 1 was rerouted off US 113 and US 13 between Dover and Smyrna.<ref name="DE 1994 map"/>
When the portion of DE 1 between Dover and Smyrna opened, road signs, with the exception of speed limit signs, were in [[Metric system|metric units]] in anticipation of the United States [[Metrication in the United States|converting to the metric system]].<ref name=dsn1394>{{cite news |last = Simpson |first = Martha |title = A car passes a sign on the Del. 1 relief route Measuring controversy Metric system on bypass draws mixed emotions |work = Delaware State News |location = Dover |date = January 3, 1994 }}</ref> The section of DE 1 between Dover and Smyrna had exit numbers based on kilometerposts while the section between Tybouts Corner and Christiana originally had exit numbers based on mileposts.<ref name="DE 1996 map"/> In 1997, the exit numbers along the portion of the route between Tybouts Corner and Christiana were changed to reflect kilometerposts.<ref name="DE 1997 map">{{Delaware road map|year=1997|access-date=March 2, 2016}}</ref>
[[File:2022-07-18 09 27 42 View north along U.S. Route 13 and Delaware State Route 1 a half mile south of Exit 156 (U.S. Route 13 NORTH, TO Interstate 295, New Castle, New Jersey, New York) in Red Lion, New Castle County, Delaware.jpg|thumb|left|DE 1 northbound approaching the split with US 13 northbound in Tybouts Corner]]
In December 1995, the section of DE 1 between US 13 in St. Georges and US 13 in Tybouts Corner opened, which included the Chesapeake & Delaware Canal Bridge (now called the Senator William V. Roth Jr. Bridge).<ref name="DE 1996 map">{{Delaware road map|year=1996|access-date=November 24, 2015}}</ref><ref name=dsn12895/> Prior to the opening of this section, a bridge walk was held over the canal.<ref name=dsn12895>{{cite news |last = Kinerney |first = Butch |title = Walkers to cross Del. 1 bridge |work = Delaware State News |location = Dover |date = December 8, 1995 }}</ref> Following the completion of this segment, DE 1 was rerouted off the surface alignment of US 13 that crossed the canal on the [[St. Georges Bridge (Delaware)|St. Georges Bridge]].<ref name="DE 1996 map"/> In addition, US 13 was rerouted to follow the new DE 1 between the DE 72 interchange and Tybouts Corner.<ref name="DE 1996 map"/><ref name="AASHTO">{{AASHTO minutes |year=1996S |access-date=October 17, 2014 }}</ref> Construction of the new DE 1 had severed US 13 south of Tybouts Corner, with part of the former alignment north of the DE 7 intersection becoming a two-lane road while the section south of there became an extended DE 7 to the intersection with US 13 and DE 72.<ref name="DE 1996 map"/> In building DE 1 across the Chesapeake & Delaware Canal, there were initially plans to demolish the aging St. Georges Bridge that carried US 13 over the canal. The plan drew concerns from residents in St. Georges who feared the community would be split in half. The St. Georges Bridge was instead kept and was refurbished. A southbound exit and northbound entrance at US 13 south of the Chesapeake & Delaware Canal Bridge along DE 1 was built as required by federal legislation that gave the state $115 million toward construction of the new canal bridge.<ref>{{cite web |url = http://www.deldot.org/static/projects/sr1/3rd.html |title = State Route 1 Chesapeake and Delaware Canal Bridge to Tybouts Corner Overview |publisher = Delaware Department of Transportation |access-date = October 17, 2014 |archive-url = https://web.archive.org/web/20030624021111/http://www.deldot.org/static/projects/sr1/3rd.html |archive-date = June 24, 2003 }}</ref>
The extension of the DE 1 freeway south through Dover Air Force Base was constructed later than the Dover to Smyrna segment due to the need to coordinate negotiations with the military installation and to allow the base to remediate hazardous material sites, maintain security and access restrictions with construction of a new Main Gate, and reconstruct base housing on the west side of the highway.<ref name=SR1timeline/><ref name="On the Road 6 AFB">{{cite news |title = Dover Air Force Base Section |page = 2 |work = On the Road |issue = 6 |date = Winter 1991 |publisher = Delaware Department of Transportation |location = Dover |url = http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-6.pdf |archive-url = https://web.archive.org/web/20060929174617/http://www.deldot.gov/static/projects/sr1/pdfs/on_the_road-6.pdf |archive-date = September 29, 2006 |access-date = April 4, 2017 |url-status = dead }}</ref> Construction of an interchange at the Dover Air Force Base Main Gate commenced in February 1996.<ref name=SR1timeline/> This project resulted in the relocation of the Main Gate further back in order to build the interchange and the overpass linking the Main Gate to base housing. This construction resulted in facilities having to be constructed at the North Gate in order to be able to handle base traffic.<ref>{{cite web |url = http://www.deldot.org/static/projects/sr1/2nd.html |title = State Route 1 Dover to Smyrna Overview |publisher = Delaware Department of Transportation |access-date = October 18, 2014 |archive-url = https://web.archive.org/web/20040128180617/http://www.deldot.org/static/projects/sr1/2nd.html |archive-date = January 28, 2004 }}</ref> In May of that year, groundbreaking took place for the DE 1 toll road between Odessa and St. Georges. The first contract of the Dover Air Force Base Main Gate interchange was completed in December 1998, with the second contract beginning in March 1999.<ref name=SR1timeline/> The segment of DE 1 between US 13 south of Odessa and US 13 in St. Georges opened in November 1999.<ref name=SR1timeline/><ref name="DE 1999 map">{{Delaware road map|year=1999|access-date=November 24, 2015}}</ref> DE 1 was subsequently rerouted off US 13 between those two points.<ref name="DE 1999 map"/> DE 7 from I-95 to north of DE 58 became an extension of the freeway in 1999 with an interchange built at DE 58 in a $25 million construction project.<ref>{{cite web |archive-url = https://web.archive.org/web/20120711223752/https://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/jfkmhip_overview.shtml |archive-date = July 11, 2012 |url = http://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/jfkmhip_overview.shtml |title = I-95 Corridor Projects |publisher = Delaware Department of Transportation |access-date = October 20, 2014 }}</ref><ref>{{cite web |title = JFK Memorial Highway Improvement Program; Churchman's Road/SR 7 Interchange |publisher = Delaware Department of Transportation |url = http://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/CR-SR7/overview.shtml |access-date = February 19, 2018 |archive-url = https://web.archive.org/web/20120712050435/http://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/CR-SR7/overview.shtml |archive-date = July 12, 2012 }}</ref>
[[File:2022-07-18 09 34 22 View north along Delaware State Route 1 (Korean War Veterans Memorial Highway) just north of Exit 160 in Christiana, New Castle County, Delaware.jpg|thumb|right|DE 1 northbound past the US 40 exit in Bear]]
In March 2000, groundbreaking took place for the final segment of the DE 1 freeway between Smyrna and Odessa. The interchange at the Dover Air Force Base Main Gate was completed in July of that year.<ref name=SR1timeline/> The construction of the final segment resulted in a portion of US 13 south of Odessa being shifted further east as DE 1 would be built on top of the road. A service road would serve properties on the southbound side of US 13.<ref>{{cite news |title = FHWA Grants Final Design Approval |work = On the Road |publisher = Delaware Department of Transportation |issue = 13 |date = Spring 1993 |page = 1 |url = http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-13.pdf |access-date = October 18, 2014 |url-status = dead |archive-url = https://web.archive.org/web/20050211070008/http://www.deldot.org/static/projects/sr1/pdfs/on_the_road-13.pdf |archive-date = February 11, 2005 }}</ref> In October 2001, northbound US 13 was realigned to the new alignment south of Odessa in order to build DE 1 in that area.<ref>{{cite news |last = Gopal |first = Prashant |title = Traffic will shift onto new U.S. 13 |work = The News Journal |location = Wilmington, DE |publisher = Gannett |date = September 30, 2001 |url = http://www.deldot.org/static/projects/sr1/articles/pdf/traffic_will_shift_onto_new_us13_9-3-01.pdf |access-date = October 18, 2014 |url-status = dead |archive-url = https://web.archive.org/web/20030626133651/http://www.deldot.org/static/projects/sr1/articles/pdf/traffic_will_shift_onto_new_us13_9-3-01.pdf |archive-date = June 26, 2003 }}</ref> In May 2002, US 13 was shifted to a new southbound alignment south of Odessa, with the former portion of the route in that area becoming a service road known as Harris Road.<ref>{{cite news |last = Volturo |first = Drew |title = U.S. 13 to shift in Odessa |work = Delaware State News |location =
On May 19, 2003, Governor Minner cut the ribbon for the final section of the DE 1 toll road between US 13 north of Smyrna and US 13 south of Odessa.<ref name=dsn52003/><ref name="DE 2003 map">{{Delaware road map|year=2003|access-date=November 24, 2015}}</ref> This section opened to traffic two days later.<ref name=dsn52003>{{cite news |last = Volturo |first = Drew |title = Downstate Transportation End of the Road Ribbon cut on last section of Del. 1 |work = Delaware State News |location = Dover
Traffic congestion at the cloverleaf interchange with I-95 in Christiana led to DelDOT to improve the interchange. The project included adding flyover connecting ramps from northbound DE 1 to northbound I-95 and from southbound I-95 to southbound DE 1 which allowed for easier merging patterns and the elimination of lengthy backups on the former ramp design.<ref>{{cite web |title = Major improvements underway to Route 1 and I-95 interchange |url = http://www.newarkpostonline.com/news/article_57e20745-5687-51b3-9d23-05f3c5671995.html |work = [[Newark Post]] |access-date = March 24, 2012 |date = December 9, 2011 }}</ref><ref>{{cite web |title = I-95 Corridor Projects – SR1 / I-95 Interchange |url = http://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/sr1-i95/overview.shtml |publisher = Delaware Department of Transportation |access-date = March 24, 2012 |url-status = dead |archive-url = https://web.archive.org/web/20120312170637/http://www.deldot.gov/information/projects/jfk_mem_hwy_improvement/sr1-i95/overview.shtml |archive-date = March 12, 2012 }}</ref> Construction began in February 2011 with work to replace the bridge over DE 1/DE 7 leading to the Christiana Mall in order to allow room for the flyover ramps;<ref>{{cite web |title = Christiana Mall Road Bridge to be Rebuilt |url = http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3914 |publisher = Delaware Department of Transportation |access-date = March 24, 2012 |date = February 21, 2011 |url-status = dead |archive-url = https://web.archive.org/web/20110511142646/http://www.deldot.gov/public.ejs?command=PublicNewsDisplay&id=3914 |archive-date = May 11, 2011 |df = mdy-all }}</ref> this bridge was completed in March 2012.<ref>{{cite web |title = New Christiana Mall Road Bridge open |url = http://www.newarkpostonline.com/business/article_9794000c-693a-11e1-aff1-001871e3ce6c.html |work = Newark Post |access-date = March 24, 2012 |date = March 8, 2012 }}</ref> The ramp from southbound I-95 to southbound DE 1 opened on August 27, 2013, and the ramp from northbound DE 1 to northbound I-95 opened on October 17, 2013, with a ribbon-cutting ceremony attended by Governor Markell and DelDOT secretary Bhatt.<ref name=wcau82713>{{cite web |last = Chang |first = David |title = New Flyover Ramp Provides Easier Commute for Del. Drivers |publisher = WCAU-TV |location = Philadelphia, PA |date = August 27, 2013 |access-date = September 18, 2013 |url = http://www.nbcphiladelphia.com/news/local/New-Flyover-Ramp-Provides-Easier-Commute-for-Del-Drivers-220996071.html }}</ref><ref>{{cite web |title = Major Improvements Completed on I-95/SR-1 Interchange |url = http://www.deldot.gov/home/newsroom/release.shtml?id=4933 |publisher = Delaware Department of Transportation |date = October 17, 2013 |access-date = October 24, 2013 }}</ref>
[[File:2022-07-18 09 55 18 View south along Delaware State Route 1 and Delaware State Route 7 (Korean War Veterans Memorial Highway) at Exit 164A (Mall Road) in Christiana, New Castle County, Delaware.jpg|thumb|left|DE 1/DE 7 southbound at the Mall Road interchange in Christiana]]
DelDOT has plans to widen DE 1 by an additional lane in each direction between the Senator William V. Roth Jr. Bridge and the DE 273 interchange in Christiana. The project will involve widening bridges and reconfiguring interchanges. The project is currently in the design and planning stage.<ref>{{cite web |title = SR 1 Widening, SR273 to the Roth Bridge |publisher = Delaware Department of Transportation |url = https://deldot.gov/projects/index.shtml?dc=details&projectNumber=T200511001 |access-date = October 22, 2021 }}</ref> A project began on September 21, 2015, to construct a northbound auxiliary lane between the US 40 and DE 273 interchanges in order to reduce congestion, which was completed in November 2015.<ref>{{cite press release |title = DelDOT to begin the SR 1 Northbound Auxiliary Lane, U.S. Route 40 to SR 273 Project |publisher = Delaware Department of Transportation |date = September 11, 2015 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=5695 |access-date = September 12, 2015 }}</ref> On March 20, 2020, construction began on a southbound auxiliary lane between the DE 273 and US 40 interchanges; this auxiliary lane opened to traffic in November 2020.<ref>{{cite press release |title = Traffic Alert - DelDOT Announces Opening of New Route 1 Southbound Auxiliary Lane |publisher = Delaware Department of Transportation |date = November 12, 2020 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=8394&type=Traffic |access-date = November 12, 2020 }}</ref> On October 27, 2021, a virtual public workshop on the widening and reconstruction project between the Senator William V. Roth Jr. Bridge and DE 273 was held. The preferred alternative for the project includes the construction of a southbound exit and northbound entrance at Newtown Road and the reconstruction of the DE 273 interchange into a [[single-point urban interchange]].<ref>{{cite web |title = Welcome to the SR 1 Widening, Road A to Tybouts Corner - Virtual Public Workshop |publisher = Delaware Department of Transportation |date = October 27, 2021 |url = https://deldot.gov/public.ejs?command=PublicProjectPortalDocument&iDID=8768501&iProjectObjectID=2579 |access-date = November 16, 2021 }}</ref> The construction project of widening DE 1 between US 40 in Bear and DE 7 in Christiana will receive federal funding from the [[Infrastructure Investment and Jobs Act]] signed into law by President [[Joe Biden]] in 2021, which will allow for an earlier start to the project.<ref>{{cite press release |title = Governor Carney Announces New Projects, Protecting Transportation Network Part of Infrastructure Funds Focus |publisher = State of Delaware |date = March 30, 2022 |url = https://news.delaware.gov/2022/03/30/governor-carney-announces-new-projects-protecting-transportation-network-part-of-infrastructure-funds-focus/ |access-date = May 28, 2022 }}</ref><ref>{{cite news |last = Barrish |first = Chris |title = Federal dollars to help Delaware ease traffic congestion around Christiana Mall |publisher = WHYY |location = Philadelphia, PA |date = April 2, 2022 |url = https://whyy.org/articles/delaware-traffic-congestion-christiana-mall-infrastructure-funding/ |access-date = May 28, 2022 }}</ref>
On April 29, 2016, Governor Markell, DelDOT secretary Cohan, and local officials attended a groundbreaking ceremony for a $7 million project that rebuilt the DE 72 interchange into a diverging diamond interchange, the first such interchange in Delaware.<ref>{{cite press release |title = Start of Construction for Delaware's First Diverging Diamond Interchange Celebrated by State and Local Officials |publisher = Delaware Department of Transportation |date = April 29, 2016 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=6017 |access-date = May 2, 2016 }}</ref> The diverging diamond interchange configuration was put into place on November 19, 2016.<ref>{{cite press release |title = Traffic Pattern Activiated for the New Diverging Diamond Interchange at State Route 1 and Route 72 |publisher = Delaware Department of Transportation |date = November 18, 2016 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=6325 |access-date = November 21, 2016 }}</ref>
On April 19, 2017, a virtual weigh station opened along northbound DE 1 south of the interchange with US 13 north of Smyrna. This weigh station allows trucks to be weighed at highway speeds; trucks with possible violations are instructed by signs to exit and follow US 13 north to a weigh station in [[Blackbird, Delaware|Blackbird]] for additional screening and assessment while trucks with no issues are allowed to remain on DE 1. The virtual weigh station was constructed to ensure trucks traveling north through Delaware were being weighed after the completion of DE 1 in 2003 allowed truck traffic to bypass the weigh station along US 13.<ref>{{cite press release |title = SR 1 Virtual Weigh Station Opening - Kent County |publisher = Delaware Department of Transportation |date = April 19, 2017 |url = http://www.deldot.gov/home/newsroom/release.shtml?id=6529 |access-date = April 19, 2017 }}</ref>
On December 24, 2018, the ramp from US 13 to northbound DE 1 in St. Georges moved further south to the Biddles Corner mainline toll plaza as part of the project constructing the US 301 toll road.<ref>{{cite press release |title = Traffic Alert - Updated: US 301 Mainline Project - Opening of New SR 1 NB Free Ramp |publisher = Delaware Department of Transportation |date = December 14, 2018 |url = https://deldot.gov/About/news/index.shtml?dc=release&id=7441 |access-date = December 18, 2018 }}</ref><ref>{{cite web |title = Real-Time Travel Advisory |publisher = Delaware Department of Transportation |date = December 24, 2018 |url = https://www.deldot.gov/public.ejs?command=PublicTrafficIncidentDisplay&id=102256 |access-date = December 25, 2018 }}</ref> The interchange with the northern terminus of the US 301 toll road opened to traffic on January 10, 2019.<ref>{{cite news |last = Smith |first = Jerry |title = U.S. 301 Mainline toll road opens Thursday to cheers and jeers |work = The News Journal |location = Wilmington, DE |date = January 10, 2019 |url = https://www.delawareonline.com/story/news/2019/01/10/u-s-301-mainline-opens-thursday-cheers-and-jeers/2524454002/ |access-date = January 10, 2019 }}</ref>
There is a proposal to construct an interchange along DE 1 in Dover that would provide direct access to the [[Dover Mall]] in order to improve business at the shopping mall. The interchange, which is planned to cost $31 million, is supported by mall owner [[Simon Property Group]] along with government officials. The interchange proposal would include a toll plaza at the ramps.<ref>{{cite news |last = Smith |first = Jerry |title = $31 million road could prop up Dover Mall |work = The News Journal |location = Wilmington, DE |date = February 6, 2017 |url = https://www.delawareonline.com/story/news/local/2017/02/06/31-million-road-could-prop-up-dover-mall/97288290/ |access-date = October 5, 2022 }}</ref>
==Major intersections==
Line 250 ⟶ 163:
|ospan=4
|espan=4
|county=Sussex
|cspan=17
Line 278 ⟶ 190:
|bridge=[[Indian River Inlet Bridge]]}}
{{DEint|old
|ospan=
|espan=
|location=Dewey Beach
|mile=17.17
Line 321 ⟶ 233:
|type=concur
|exit=
|road={{jct|state=DE|US|9|dir1=west|DE|404|dir2=west|name2=Lewes Georgetown Highway|US-Bus|9|dab3=Lewes|dir3=east|name3=Savannah Road|to4=to|DE|
|notes=Northern terminus of US 9 concurrency; termini of
{{DEint|old
|location=none
|lspan=2
|mile=30.46
|exit=49
|road={{jct|state=DE|SR|16|name1=Broadkill Road|city1=Milton|city2=Greenwood|location3=[[Chesapeake Bay Bridge|Bay Bridge]]|city4=Broadkill Beach}}
|notes=Interchange under construction}}
{{DEint|old
|ospan=6
|espan=6
|mile=32.68
|exit=
Line 578 ⟶ 492:
{{jctbtm|col=8|keys=concur,incomplete,toll}}
==
===DE 1A===
{{Main|Delaware Route 1A}}
Line 591 ⟶ 506:
|formed=1974<ref name="MD 1974 map"/>
}}
'''Delaware Route 1A''' ('''DE 1A''') is a [[state highway]] in [[Sussex County, Delaware|Sussex County]]. The route, which is signed north-south, runs {{convert|2.01|mi|km|abbr=on}} from
What is now DE 1A was originally a part of [[Delaware Route 14|DE 14]] between 1936 and 1942.<ref name="DE 1936 map"/><ref name="DE 1942 map"/> The road was designated '''DE 14A''' by 1966.<ref name="DE 1966 map"/> In the 1970s, DE 1A was designated along DE 14A for a few years before DE 14A was decommissioned in favor of DE 1A.<ref name="MD 1974 map">{{Maryland road map|year=1974}}</ref><ref name="MD 1977 map"/> Between 2002 and 2006, a streetscape project revitalized the Rehoboth Avenue portion of the route and a [[roundabout]] was added at the northern entrance to Rehoboth Beach.<ref name=cg62206>{{cite news |last = Spence |first = Kevin |title = Rehoboth celebrates completion of Streetscape |work = Cape Gazette |date = June 22, 2006 |page = 4 |url = https://news.google.com/newspapers?id=zbNkAAAAIBAJ&pg=1679,2967006&dq=rehoboth+beach+streetscape+improvement+project&hl=en |access-date = February 6, 2013 }}</ref><ref name=cg61104>{{cite news |last = Lytle |first = Tara |title = Roundabout gets a round of criticism |work = Cape Gazette |date = June 11, 2004 |page = 1 |url = http://cpg.stparchive.com/Archive/CPG/CPG06112004p001.php |access-date = February 6, 2013 }}</ref>
{{Clear}}
===DE 1B===
Line 634 ⟶ 540:
}}
{{jctbtm|keys=incomplete}}
{{Clear}}
===DE 1D===
{{Infobox road small
|state=DE
|type=DE
|route=1D
|location=[[Midway, Delaware|Midway]]–[[Nassau, Delaware|Nassau]]
|length_mi=3.92
|length_round=2
|length_ref=<ref name=DelDOT/>
|formed=1996<ref name="DE 1996 map"/>
}}
[[File:2022-07-15 11 48 43 View north along Delaware State Route 1D and west along Delaware Route 24 Alternate (Plantation Road) at Delaware State Route 24 (John J Williams Highway) in Midway, Sussex County, Delaware.jpg|thumb|right|DE 1D northbound past DE 24 in Midway]]
'''Delaware Route 1D''' ('''DE 1D''') is a [[state highway]] that is an auxiliary route of DE 1 in [[Sussex County, Delaware|Sussex County]]. The route begins at DE 1 in the community of [[Midway, Delaware|Midway]], where it heads southwest [[concurrency (road)|concurrent]] with [[Delaware Route 24|DE 24]] on four-lane [[divided highway|divided]] John J. Williams Highway, soon becoming undivided. The road passes homes and businesses as it transitions into a five-lane road with a [[center left-turn lane]]. DE 1D splits from DE 24 by turning northwest onto two-lane undivided Plantation Road concurrent with [[Delaware Route 24 Alternate|DE 24 Alt.]] The road heads through a mix of farmland and residential development. Upon reaching the Five Points intersection in the community of [[Nassau, Delaware|Nassau]], the road curves west, coming to a [[roundabout]] with [[Delaware Route 23|DE 23]]. At this point, DE 1D ends while the road continues southwest as DE 23 and DE 24 Alt. DE 23 heads north at this point to immediately intersect [[U.S. Route 9 in Delaware|US 9]]/[[Delaware Route 404|DE 404]], which head east to provide access to DE 1.<ref name="DE 2017 map"/><ref name="google1D">{{google maps |url=https://www.google.com/maps?saddr=DE-1D/DE-24+W/John+J+Williams+Hwy&daddr=38.7438851,-75.1703518+to:DE-1D/DE-23+S&hl=en&sll=38.745783,-75.173317&sspn=0.004845,0.010568&geocode=FQQATwIds4yF-w;FU0vTwId0f2E-ymj-ynqzLm4iTEov7HuthZTOQ;FVc7TwId_-eE-w&t=h&mra=ls&via=1&z=14|title=overview of Delaware Route 1D|access-date=December 19, 2013}}</ref> Plantation Road serves as an alternate to DE 1, which sees heavy traffic in the summer months.<ref name=tnj7314/>
In 1991, the Five Points intersection was reconfigured to separate the DE 23 and Plantation Road intersection from US 9/DE 404, with a short connector road linking US 9/DE 404 to the two roads. In addition, a jughandle was constructed from eastbound US 9/DE 404 to northbound DE 1.<ref name=fivepoints/> DE 1D was designated by 1996.<ref name="DE 1996 map"/> The portion of the route along Plantation Road became concurrent with DE 24 Alt. by 2006.<ref name="DE 2006 map"/> In 2022, construction began to reconfigure the intersection between US 9/DE 404 and DE 1D/DE 23 that would realign DE 1D and DE 23 to meet at a roundabout and intersect a longer connector road linking to US 9/DE 404 and also build a direct ramp from southbound DE 1 to US 9/DE 404 at the DE 1D/DE 23 intersection. Construction on this project is planned to be finished in 2024.<ref name=fivepoints/><ref name=plantation/> The roundabout at the DE 1D and DE 23 junction opened on April 19, 2024, with the connection between the roundabout and US 9/DE 404 opening on May 16.<ref name=wboc51624>{{cite news|last=Curtis|first=Sean|title=Five Points Roundabout Fully Opens|publisher=WBOC-TV|location=Salisbury, MD|date=May 16, 2024|url=https://www.wboc.com/news/five-points-roundabout-fully-opens/article_a430a6b4-138f-11ef-99f2-1f21f7e4ac36.html|access-date=May 16, 2024}}</ref><ref>{{cite news|title=New Five Points roundabout partially open, says DelDOT|work=Cape Gazette|date=April 19, 2024|url=https://www.capegazette.com/article/new-five-points-roundabout-partially-open-says-deldot/274056|access-date=April 19, 2024}}</ref>
'''Major intersections'''<br />
{{Jcttop|length_ref=<ref name=DelDOT/>|state=DE|county=Sussex}}
{{DEint
|location=Midway
|lspan=2
|mile=3.92
|type=concur
|road={{jct|state=DE|DE|1|nolink1=yes|name1=Coastal Highway|city1=Lewes|city2=Rehoboth Beach}}<br />{{jct|state=DE|DE|24|dir1=begins}}
|notes=Southern terminus; south end of DE 24 overlap; eastern terminus of DE 24
}}
{{DEint
|mile=3.19
|type=concur
|road={{jct|state=DE|DE|24|dir1=west|name1=John J. Williams Highway}}<br />{{jct|state=DE|DE-Alt|24|dir1=begins}}
|notes=North end of DE 24 overlap; south end of DE 24 Alt. overlap; eastern terminus of DE 24 Alt.
}}
{{DEint
|location=Nassau
|mile=0.00
|type=concur
|road={{jct|state=DE|DE|23|DE-Alt|24|dir2=west|name2=Beaver Dam Road|to3=to|US|9|DE|404|DE|1|nolink5=yes}}
|notes=Roundabout; northern terminus; north end of DE 24 Alt. overlap
}}
{{jctbtm|keys=concur}}
{{Clear}}
Line 649 ⟶ 597:
}}
[[File:DE 1 BUS NB past DE 36.jpeg|thumb|right|DE 1 Bus. northbound past DE 36 in Milford]]
'''Delaware Route 1 Business''' ('''DE 1 Bus.''') is a [[business route]] of DE 1 that runs through the city of [[Milford, Delaware|Milford]]. DE 1 Bus. starts at a partial interchange with DE 1 southeast of Milford in [[Sussex County, Delaware|Sussex County]], with access to southbound DE 1 and from northbound DE 1. At this interchange, the business route intersects the northern terminus of [[Delaware Route 30|DE 30]], with access from southbound DE 1 Bus. to DE 30 and access from DE 30 to northbound DE 1 Bus. From this interchange, the route heads northwest into Milford as two-lane undivided South Rehoboth Boulevard, passing residential subdivisions. The road continues past homes and some businesses, passing to the east of Marshalls Pond before reaching an intersection with [[Delaware Route 36|DE 36]]. DE 1 Bus. curves north before it heads northwest into wooded areas and passes over the [[Mispillion River]] on a [[Moveable bridge|drawbridge]], at which point it enters [[Kent County, Delaware|Kent County]] and becomes North Rehoboth Boulevard. The route continues into business areas and crosses [[Delaware Route 14|DE 14]]. The road runs past commercial establishments, heading to the southwest of a [[Perdue Farms]] chicken plant, and turns north onto North Walnut Street. DE 1 Bus. passes to the west of [[Milford High School (Delaware)|Milford High School]] and heads north to an intersection with [[U.S. Route 113|US 113]], at which point it becomes [[concurrency (road)|concurrent]] with that route on four-lane [[divided highway|divided]] Dupont Boulevard. US 113/DE 1 Bus. continue north for a short distance and end at a partial interchange with DE 1 at the north end of Milford, with access to northbound DE 1 and from southbound DE 1.<ref name="DE 2017 map"/><ref name="google1Bus">{{google maps |url=
What is now DE 1 Bus. south of DE 36 and along North Walnut Street and US 113 was completed as a state highway by 1925.<ref name="DE 1925 map"/> In 1926, suggestions were made to build a bypass east of Milford connecting US 113 (DuPont Boulevard) north of town to the state highway leading from Milford southeast to [[Rehoboth Beach, Delaware|Rehoboth Beach]] in order to provide a better route to the beaches and reduce traffic congestion in Milford during the summer months.<ref name="1926 report">{{cite book |title = Delaware State Highway Department Report |edition = 1926 |page = 35 |publisher = Delaware State Highway Department |location = Dover
'''Major intersections'''<br />
Line 694 ⟶ 642:
}}
{{jctbtm|keys=concur,incomplete}}
{{Clear}}
Line 740 ⟶ 648:
==References==
{{Reflist
==External links==
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