U.S. Route 1

"US-1" redirects here. For the Japanese US-1 flying boat, see Shin Meiwa US-1A.

U.S. Route 1 marker

U.S. Route 1
Route information
Length: 2,369 mi[1] (3,813 km)
Existed: 1926 – present
Major junctions
South end: Whitehead Street / Fleming Street in Key West, FL
North end: Route 161 in Clair, New Brunswick, Canada (CA)
States: Florida, Georgia, South Carolina, North Carolina, Virginia, District of Columbia, Maryland, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine
Highway system

U.S. Route 1 (US 1) is a major north–south U.S. Highway that serves the East Coast of the United States. It runs 2,369 miles (3,813 km), from Fort Kent, Maine, at the Canada–US border, south to Key West, Florida, making it the longest north-south road in the United States.[2] US 1 is generally paralleled by Interstate 95, though the former is significantly farther west (inland) between Jacksonville, Florida, and Petersburg, Virginia. The highway connects most of the major cities of the east coast, including Miami, Richmond, Washington, D.C., Baltimore, Philadelphia, New York City, and Boston, passing from the Southeastern United States to New England.

While US 1 is generally the easternmost of the main north–south U.S. Highways, part of Routes 9, 13, 15, 17, 21, occupy corridors closer to the ocean. When the road system was laid out in the 1920s, US 1 was mostly assigned to the existing Atlantic Highway, which followed the Fall Line between the Piedmont and the Atlantic Coastal Plain north of Augusta, Georgia.[3] At the time, the highways farther east were of lower quality and did not serve the major population centers.[4] At the time of its construction, Route 99 was its equivalent along the western coast of the United States, before being succeeded by Route 101 which is currently replaced by Interstate 5 as the main highway.

Route description


Mile zero in Key West

US 1 travels along the east coast of Florida, beginning at 490 Whitehead St. in Key West[5] and passing through Miami, Hollywood, Fort Lauderdale, West Palm Beach, Jupiter, Fort Pierce, Melbourne, Cocoa, Titusville, Daytona Beach, Palm Coast, St. Augustine, and Jacksonville. The southernmost piece through the Florida Keys, about 100 miles (160 km) long, is the two-lane Overseas Highway, originally built in the 1930s after the Florida East Coast Railway's Overseas Railroad was ruined by the Labor Day Hurricane of 1935. The rest of US 1 in Florida is generally a four-lane divided highway, despite the existence of the newer I-95 not far away. State Road A1A is a continuous beachfront alternate to US 1, cut only by assorted unbridged inlets and the Kennedy Space Center. North of Jacksonville, US 1 turns northwest towards Augusta, Georgia; US 17 becomes the coastal route into Virginia, where US 13 takes over.[6] In Florida until the 1990s, US 1 used high-contrast markers (white text on a red background).[7]


Downtown Augusta skyline as seen from US 1 in North Augusta near I-520 exit #17

The part of US 1 in Georgia, as it shifts from the coastal alignment in Florida to the Fall Line alignment in South Carolina, is generally very rural, passing through marshes and former plantations between the towns and cities of Folkston, Waycross, Alma, Baxley, Lyons, Swainsboro, and Augusta. The Georgia Department of Transportation has an ongoing plan to widen all of US 1 to four lanes with bypasses which is more than 50 percent complete.

The Carolinas

I-40 east approaching the Raleigh Beltline, which includes US 1.
Main articles: U.S. Route 1 in North and South Carolina

In South Carolina, US 1 generally serves mostly rural areas as it falls west of I-95 while the coastal areas are served by routes east of it. Starting in South Carolina, US 1 is paralleled by Interstate 20 along the Fall Line through Aiken, Lexington, and Columbia to Camden and Lugoff. US 1 functions as a local two-lane road with occasional boulevard stretches. After Camden, US 1 continues northeast away from any Interstate towards Bethune, Patrick, McBee and Cheraw with no bypasses or four-lane sections except around Cheraw through the US 52 and SC 9 multiplexes. After SC 9, it continues northward into North Carolina as a two-lane highway. SCDOT has no plans to widen or bypass any US 1 alignments northeast of Camden to the North Carolina line.

Between the South Carolina line and the US 74 bypass, US 1 is a two-lane road but sees a considerable amount of truck and tourist traffic of people cutting through from the US 74/US 220 and I-73/I-74 corridor attempting to reach points south and east. US 1 goes through downtown Rockingham, with a bypass in the future plans. North of the NC 177 junction, it becomes four lanes or greater, becoming a super-street with limited access and then becoming a limited access freeway. US 1 becomes a major artery for the state as it moves north of Rockingham. After Richmond County, it goes into Moore County with two expressway bypasses in Southern Pines, Vass and Cameron. US 1 continues with the Jefferson Davis Highway label through Lee County and Sanford, and on to Cary and Raleigh. US 1 runs concurrently with US 64 through most of Cary, where the freeway recently underwent a major renovation and improvements that added lanes in both directions.[8] North of Raleigh, US 1 (known as Capital Boulevard in northern Wake County) crosses Interstate 540 and then again becomes a four-lane divided arterial to Interstate 85 near Henderson. The North Carolina Department of Transportation has begun a corridor study for this section of US 1.[9] Moreover, NCDOT is planning to finish four-laning US 1 in Richmond County past NC 177 with a Rockingham bypass to the east. There are no plans from SCDOT to widen US 1 from the state line. From Henderson into Virginia, US 1 runs parallel with I-85 as a two-lane local road until the state line, where Virginia hosts a continuous third center lane for alternate passing towards US Highway 58 before South Hill.

Mid-Atlantic Region

The 14th Street Bridge, Washington, D.C.
Main articles: U.S. Route 1 in Virginia, District of Columbia, Maryland, Pennsylvania, New Jersey, and New York

In the Mid-Atlantic region, US 1 generally serves some of the most populated areas of the east coast. Through Virginia, US 1 is paralleled by Interstates: the remainder of Interstate 85 to Petersburg, Interstate 95 through Richmond and Fredericksburg to Alexandria, and Interstate 395 into Arlington. Within Virginia, US 1 is called Jefferson Davis Highway by state law, although most of the Fairfax County portion, except Lorton,[10] is better known as Richmond Highway. US 1 crosses the Potomac River with I-395 on the 14th Street Bridges, and splits to follow mainly 14th Street and Rhode Island Avenue through the District of Columbia. US 1 is at the minimum a 3 lane (with alternate passing) from the N.C. line to Petersburg with occasional four lane divided sections. North of Petersburg is a four lane undivided roadway at the minimum to the D.C. line. The route of US 1 from Petersburg to the state line is parallel with the Fall Line. From Petersburg onwards it is parallel with Interstate 95. After exiting the District into Maryland, US 1 follows the Baltimore-Washington Boulevard, the first of several modern highways built along the Baltimore-Washington corridor; I-95 is the newest, after the Baltimore-Washington Parkway. US 1 runs through the University of Maryland campus in College Park, MD. The route bypasses downtown Baltimore on North Avenue and exits the city to the northeast on Belair Road, gradually leaving the I-95 corridor, which passes through Wilmington, Delaware, for a straighter path towards Philadelphia. Around and beyond Bel Air, US 1 is a two-lane road, crossing the Susquehanna River over the top of the Conowingo Dam before entering Pennsylvania. (U.S. 1 bypasses Delaware, unlike I-95.)[6]

Roosevelt Boulevard, Philadelphia, PA

The two-lane US 1 becomes a four-lane freeway, officially known as the John H. Ware III Memorial Highway, just after crossing into Pennsylvania. This bypass extends around Oxford and Kennett Square, merging into the four-lane divided Baltimore Pike just beyond the latter. At Media, US 1 again becomes a freeway – the Media Bypass – ending just beyond Interstate 476. After several name changes, the road becomes City Avenue, the western city limit of Philadelphia, at the end of which a short overlap with the Schuylkill Expressway (I-76) leads to the Roosevelt Expressway and then the twelve-lane Roosevelt Boulevard partly overlapping US 13. US 1 again becomes a freeway after leaving the city, bypassing Penndel and Morrisville and crossing the Delaware River into New Jersey on the Trenton-Morrisville Toll Bridge.[6]

The Pulaski Skyway, in Jersey City, Kearny, and Newark, NJ

After crossing into New Jersey in Mercer County, US 1 continues on the Trenton Freeway through the city of Trenton and Lawrence as a four lane freeway. As the freeway ends, the four lane divided highway upgrades to six lanes after I-95/I-295 passing through the Penns Neck section of West Windsor Township. Through Penns Neck is a series of traffic signals. NJDOT is looking to revamp the highway through this area by replacing traffic signals with grade separations. The highway enters Middlesex County through Plainsboro and South Brunswick. By Forrestal Village, the highway downgrades from 6 to 4 lanes until after Finnegans Lane in North Brunswick. Northward, it continues through New Brunswick as a short jersey-freeway until the CR 529/Plainfield Avenue traffic signal in Edison. Through Edison and Woodbridge has a mix of boulevard and jersey freeway segments and continues to do so after the US 9 juncture in the Avenel section of Woodbridge. The US 1/9 concurrency continues through the rest of the state. The six lane divided highway remains through Rahway in Union County and Elizabeth, until it reaches the Newark Airport, where it becomes a dual carriageway freeway around downtown Newark in Essex County with a 2-2-2-2 configuration. The historic Pulaski Skyway takes US 1/9 into Jersey City, and the route exits the freeway at Tonnele Circle to head north into Bergen County. US 1/9 turns onto US 46 as a jersey-freeway, and the three routes run northeast to the George Washington Bridge Plaza, where they merge into I-95. US 46 ends in the middle of the bridge, which crosses the Hudson River into New York, and US 9 exits just beyond onto Broadway in Manhattan, but US 1 stays with I-95 onto the Cross Bronx Expressway, exiting in the Bronx onto Webster Avenue. Two turns take US 1 via Fordham Road to Boston Road, which it follows northeast out of the city to the state line, never straying far from I-95.[6] As it enters Greenwich, Connecticut, it continues as a two lane local road.

New England

Main articles: U.S. Route 1 in Connecticut, Rhode Island, Massachusetts, New Hampshire, and Maine

In New England, US 1 generally serves large cities in a side street capacity. In Connecticut, US 1 serves the shore of the Long Island Sound parallel to I-95. Beyond New Haven, the highway travels east–west, and some signs in the state indicate this rather than the standard north–south. While I-95 in Rhode Island takes a diagonal path to Providence, US 1 continues east along the coast through Westerly to Wakefield, where it turns north and follows Narragansett Bay. Most of this part is a four-lane divided highway, providing access to Route 138 towards Newport. After Route 4 splits as a mostly-freeway connection to I-95, US 1 becomes a lower-speed surface road, passing through Warwick, Providence, and Pawtucket. The route parallels I-95 again through Providence and Pawtucket and into Massachusetts, traveling towards Boston as a four-lane road. When it reaches Dedham, US 1 turns east, overlapping I-95 and I-93 east to Braintree and north through Downtown Boston. The Tobin Bridge and Northeast Expressway take US 1 out of Boston, after which it again parallels I-95 through Newburyport to the New Hampshire state line.[6]

Former Memorial Bridge between New Hampshire and Maine
The monument marking the northern terminus in Fort Kent, ME
Monument in Fort Kent dedicated to US Highway 1

The short portion of US 1 in New Hampshire follows the historic Lafayette Road, staying close to I-95, passing through Portsmouth before crossing the Piscataqua River on the former Memorial Bridge, which was demolished and replaced during 2012–13, leaving a temporary gap in US 1. During construction, drivers had to detour to one of two other nearby bridges carrying U.S. Route 1 Bypass or Interstate 95. Within Maine, US 1 begins as a parallel route to I-95 near the Atlantic Ocean. At Portland, I-95 splits off to the north, and I-295 heads northeast paralleling US 1 to Brunswick. There US 1 turns east as a mostly two-lane road along the coast to Calais; much of this portion is advertised as the "Coastal Route" on signs. North from Calais, US 1 follows the Canada–US border, crossing I-95 in Houlton and eventually turning west and southwest to its "north" end at the Clair-Fort Kent Bridge in Fort Kent. The short Route 161 extends north on the New Brunswick (Canada) side of the bridge to Route 120, a secondary east–west route from Edmundston, New Brunswick west to Quebec Route 289 toward Saint-Alexandre, Quebec.[6]


Marker used for Route 1 in New England (1922)

The direct predecessor to US 1 was the Atlantic Highway, an auto trail established in 1911 as the Quebec-Miami International Highway. In 1915 it was renamed the Atlantic Highway,[11] and the northern terminus was changed to Calais, Maine.[12] Due to the overlapping of auto trail designations, portions of the route had other names that remain in common use, such as the Boston Post Road between Boston and New York, the Lincoln Highway between New York and Philadelphia, Baltimore Pike between Philadelphia and Baltimore, and the Dixie Highway in and south of eastern Georgia. North of Augusta, Georgia, the highway generally followed the Eastern U.S. Fall Line, rather than a more easterly route through the swamps of the Atlantic Coastal Plain.[13] Brickell Avenue is the name given to the 2.4 mile stretch of U.S. Route 1 in Miami, Florida just south of the Miami River until the Rickenbacker Causeway.

When the New England road marking system was established in 1922, the Atlantic Highway within New England was signed as Route 1, with a Route 24 continuing north to Madawaska;[14] New York extended the number to New York City in 1924 with its own Route 1.[15] Other states adopted their own systems of numbering, and by 1926 all states but Maryland had signed the Atlantic Highway as various routes, usually changing numbers at the state line. In 1925, the Joint Board on Interstate Highways created a preliminary list of interstate routes to be marked by the states,[16] including Route 1 along the Atlantic. This highway began at Fort Kent, Maine and followed the existing Route 24 to Houlton and Route 15 to Bangor, beyond which it generally followed the Atlantic Highway to Miami.[17] In all states but Georgia that had numbered their state highways, Route 1 followed only one or two numbers across the state.[18] The only significant deviation from the Atlantic Highway was between Augusta, Georgia and Jacksonville, Florida, where Route 1 was assigned to a more inland route, rather than following the Atlantic Highway via Savannah.[4]

One of the many changes made to the system before the final numbering was adopted in 1926 involved US 1 in Maine. The 1925 plan had assigned Route 1 to the shorter inland route (Route 15) between Houlton and Bangor, while Route 2 followed the longer coastal route via Calais. In the system as adopted in 1926, US 2 instead took the inland route, while US 1 followed the coast, absorbing all of the former Routes 24 and 1 in New England.[19][20] Many local and regional relocations, often onto parallel superhighways, were made in the early days of US 1; this included the four-lane divided Route 25 in New Jersey, completed in 1932 with the opening of the Pulaski Skyway,[21] and a bypass of Bangor involving the Waldo-Hancock Bridge, opened in 1931.[22] The Overseas Highway from Miami to Key West was completed in 1938, and soon became a southern extension of US 1.[23]

The beginning of U.S. 1 as of March 1951.

With the construction of the Interstate Highway System in and after the 1950s, much of US 1 from Houlton to Miami was bypassed by Interstate 95. Between Houlton and Brunswick, Maine, I-95 took a shorter inland route, much of it paralleling US 2 on the alignment proposed for US 1 in 1925. Between Philadelphia and Baltimore, I-95 leaves US 1 to pass through Wilmington. Most notably, I-95 and US 1 follow different corridors between Petersburg, Virginia and Jacksonville, Florida; while US 1 followed the Fall Line west of the coastal plain, I-95 takes a more direct route through the plain and its swamps. Although some of this part of US 1 was followed by other Interstates – I-85 between Petersburg and Henderson, North Carolina, and I-20 between Camden, South Carolina and Augusta, Georgia – the rest remains an independent route that has been four-laned in many places. By the late 1970s, most of I-95 had been completed, replacing US 1 as the main corridor of the east coast and relegating most of it to local road status.[24]

Major intersections

Whitehead Street and Fleming Street in Key West
I95 in Miami
US 41 in Miami
I395 in Miami
US 27 in Miami
I195 in Miami
I595 on the Dania BeachFort Lauderdale, Florida city line
US 98 in West Palm Beach
US 192 in Melbourne
US 92 in Daytona Beach
I95 in Ormond Beach
I95 near Palm Coast
I295 in Jacksonville
I95 in Jacksonville
I95 in Jacksonville. The highways travel concurrently through the city.
US 90 in Jacksonville. The highways travel concurrently through the city.
US 17 in Jacksonville. The highways travel concurrently through the city.
US 23 in Jacksonville
I95 in Jacksonville
US 23 in Jacksonville. The highways travel concurrently to north of Alma, Georgia.
I295 in Jacksonville
US 301 in Callahan. The highways travel concurrently to Homeland, Georgia.
US 82 in Waycross. US 1/US 82/SR 520 travel concurrently to west of Deenwood.
US 84 in Waycross. The highways travel concurrently through the city.
US 341 in Baxley
US 280 in Lyons
I16 in Oak Park
US 80 in Swainsboro
US 319 in Wadley
US 221 in Louisville. US 1/US 221 travel concurrently to Wrens.
I520 in Augusta
US 78 / US 278 in Augusta. US 1/US 78 travel concurrently to Aiken, South Carolina. US 1/US 278 travel concurrently to Clearwater, South Carolina. US 1/SR 10 travel concurrently to the South Carolina state line.
US 25 in Augusta. US 1/US 25 travel concurrently to North Augusta, South Carolina. US 1/SR 121 travel concurrently to the South Carolina state line.
South Carolina
I520 in North Augusta
I20 north-northeast of Aiken
US 178 in Batesburg-Leesville
US 378 in Lexington. The highways travel concurrently through the city.
I20 east of Lexington
I26 in Oak Grove
US 378 in West Columbia. The highways travel concurrently to Columbia.
US 21 / US 176 / US 321 in Columbia
US 76 in Columbia. The highways travel concurrently through the city.
I20 in Dentsville
I77 in Dentsville
US 601 in Lugoff. The highways travel concurrently to Camden.
US 521 / US 601 in Camden
US 52 south-southwest of Cheraw. The highways travel concurrently to Cheraw.
North Carolina
Future I74 / US 74 west-southwest of East Rockingham
US 220 in Rockingham
US 15 / US 501 in Aberdeen. The highways travel concurrently through the city.
US 15 / US 501 north-northeast of Cameron. The highways travel concurrently to Sanford.
US 421 in Sanford
US 64 in Cary. The highways travel concurrently to Raleigh.
I40 / I440 / US 64 in Raleigh. I-440/US 1 travel concurrently through the city.
US 70 in Raleigh
I440 / US 401 in Raleigh. US 1/US 401 travel concurrently through the city.
I540 near Raleigh
US 158 northeast of Henderson. The highways travel concurrently to Norlina.
I85 southwest of Middleburg
US 158 / US 401 in Middleburg. US 1/US 401 travel concurrently to north-northwest of Wise.
I85 / US 401 north-northwest of Wise
US 58 southwest of South Hill. The highways travel concurrently to just southwest of the city.
I85 in South Hill
I85 south of Alberta
I85 / US 460 southwest of Petersburg. US 1/US 460 Bus. travel concurrently to Petersburg.
US 301 in Petersburg. The highways travel concurrently to Richmond.
US 360 in Richmond
US 60 in Richmond
US 33 / US 250 in Richmond
I64 / I95 in Richmond
I95 in Lakeside
I295 in Glen Allen
US 17 east-northeast of Spotsylvania. The highways travel concurrently to south of Fredericksburg.
I95 / US 17 south of Fredericksburg
I95 in Lorton
I95 / I495 in Alexandria
I395 in Arlington. The highways travel concurrently to Washington, D.C.
District of Columbia
US 50 in Washington The highways travel concurrently through part of the city.
US 29 in Washington The two highways bump into each other at the intersection of 6th Street NW and Rhode Island Avenue NW.
I95 / I495 in College Park
I895 in Elkridge
I195 in Arbutus
US 40 in Baltimore
I83 in Baltimore
I695 in Overlea
US 222 in Conowingo
US 202 / US 322 in Concordville. US 1/US 322 travel concurrently through the community.
I476 east of Upper Providence Township
US 30 on the WynnewoodPhiladelphia city line
I76 on the Bala Cynwyd–Philadelphia city line. The highways travel concurrently into Philadelphia proper.
US 13 in Philadelphia. The highways travel concurrently through part of the city.
I276 in Bensalem
I95 in Woodbourne
US 13 southwest of Morrisville
New Jersey
I95 / I295 in Lawrence Township
US 130 in North Brunswick
I287 on the EdisonMetuchen city line
US 9 in Woodbridge Township. The highways travel concurrently to New York City.
I278 in Linden
I78 / I95 in Newark
US 22 in Newark
I78 / I95 in Newark
I95 in Newark
US 46 in Palisades Park. The highways travel concurrently to the New Jersey-New York state line at the George Washington Bridge.
US 9W in Fort Lee
I95 in Fort Lee. The highways travel concurrently to The Bronx, New York City.
US 46 at the New Jersey–New York state line
New York
US 9 in Manhattan, New York City
I87 in Manhattan, New York City
I95 in The Bronx, New York City
I95 in New Rochelle
I95 in Rye
I287 on the Rye–Port Chester city line
I95 in Stamford
I95 in Darien
US 7 in Norwalk
I95 in Fairfield
I95 in Fairfield
I95 in Fairfield
I95 in Stratford
I95 in Milford
I91 / US 5 in New Haven
I95 in East Haven
I95 in Branford
I95 in Guilford
I95 in Old Saybrook. The highways travel concurrently to Old Lyme.
I95 in East Lyme
I95 in New London. The highways travel concurrently to Groton.
Rhode Island
US 6 in Providence.
US 44 in Providence. The highways travel concurrently for one block.
I95 in Pawtucket. The highways travel concurrently for less than 1 mile (1.6 km).
I95 in Attleboro
I295 in North Attleborough
I495 in Plainville
I95 in Sharon
I95 on the WestwoodDedham city line. The highways travel concurrently to Canton.
I93 / I95 in Canton. I-93/US 1 travel concurrently to Boston.
US 3 in Boston
I90 in Boston
I95 in Peabody
I95 in Peabody
I95 in Danvers
New Hampshire
No major intersections
I95 in Kittery
I195 in Saco
I295 in South Portland. The highways travel concurrently to Portland.
US 302 in Portland
I495 in Falmouth
I295 in Yarmouth
I295 in Yarmouth
I295 in Freeport
I295 in Brunswick
US 201 in Brunswick
US 2 in Houlton. The highways travel concurrently through the city.
I95 in Houlton

Auxiliary routes of U.S. 1

U.S. 1 has six 3-digit auxiliary routes. In numerical order, these are:

U.S. Route 101, despite its number, is not an auxiliary route, but rather considered a primary U.S. route in its own right, running along the west coast of the U.S.

See also


  1. American Association of State Highway and Transportation Officials, United States Numbered Highways, 1989 Edition
  2. "America's longest north-south highways". http://magicvalley.com/. Times-News. Retrieved 13 October 2014. External link in |website= (help)
  3. "E. W. James on designating the Federal-aid system and developing the U.S. numbered highway plan". Fhwa.dot.gov. Retrieved 2012-08-09.
  4. 1 2 Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
  5. 490 Whitehead St (1970-01-01). "490 Whitehead St, Key West, FL 33040 – Google Maps". Maps.google.com. Retrieved 2012-08-09.
  6. 1 2 3 4 5 6 Google Maps street maps and USGS topographic maps, accessed via ACME Mapper
  7. John Gordon, The Virginian-Pilot, US Highway 17 to Florida: Scenic, Historic and Very Slow, December 29, 1993: "Drivers know they're in Florida when they notice the U.S. Highway signs are color-coded for easy recognition. The US 17 signs, for example, are yellow, while those of US 1 are red, US 90 blue. and US 27 green."
  8. Archived March 14, 2012, at the Wayback Machine.
  9. "US 1 Corridor Study". NCDOT. Retrieved 2012-08-09.
  10. "Google". Google. Retrieved 2012-08-09.
  11. William Kaszynski, The American Highway: The History and Culture of Roads in the United States, 2000, p. 38
  12. Decatur Daily Review, Many Auto Highways Gridiron the Nation, November 14, 1915
  13. Clason Map Company, Midget Map of the Transcontinental Trails of the United States, 1923
  14. New York Times, Motor Sign Uniformity, April 16, 1922, p. 98
  15. New York Times, New York's Main Highways Designated by Numbers, December 21, 1924, p. XX9
  16. Richard F. Weingroff, From Names to Numbers: The Origins of the U.S. Numbered Highway System
  17. Report of Joint Board on Interstate Highways, October 30, 1925, Approved by the Secretary of Agriculture, November 18, 1925
  18. The following routes were used, shown on the 1926 Rand McNally:
    • Florida: 4
    • Georgia: 15, 17, and 24
    • South Carolina: 12 and 50
    • North Carolina: 50
    • Virginia: 31
    • Maryland: state highways were not numbered prior to the U.S. Highway system
    • Pennsylvania: 12 and 1
    • New Jersey: 13 and 1
    • New York: 1
    • New England: 1 and 24, and a small piece of 160 beyond Madawaska, Maine (in the 1925 plan, part of 15 was also used)
  19. Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: U.S. Geological Survey. OCLC 32889555. Retrieved November 7, 2013 via University of North Texas Libraries.
  20. United States Numbered Highways, American Highways (AASHO), April 1927
  21. Hart, Steven (2007). The Last Three Miles: Politics, Murder, and the Construction of America's First Superhighway. The New Press. pp. 1–5. ISBN 978-1-59558-098-6.
  22. Maine Department of Transportation, Waldo-Hancock Bridge, accessed October 2007 Archived June 5, 2011, at the Wayback Machine.
  23. State Road Department of Florida, Official State Road Map of Florida, 1941
  24. Gulf, Tourgide: United States, Canada and Mexico (Rand McNally & Company), 1977

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