U.S. Route 1

US 1Route 1Atlantic HighwayU.S. 1U.S. Highway 1Lafayette RoadU.S. Routes 1US Highway 1US-1Washington Boulevard
U.S. Route 1 (US 1) is a major north–south U.S.wikipedia
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Interstate 95

I-9595I‑95
US 1 is generally paralleled by I-95, though the former is significantly farther west (inland) between Jacksonville, Florida, and Petersburg, Virginia. 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. During construction, drivers had to detour to one of two other nearby bridges carrying U.S. Route 1 Bypass or Interstate 95.
Interstate 95 (I-95) is the main Interstate Highway on the East Coast of the United States, running largely parallel to the Atlantic Ocean coast and U.S. Highway 1, serving areas from Florida to Maine.

U.S. Route 17

US 1717U.S. 17
North of Jacksonville, US 1 turns northwest towards Augusta, Georgia; US 17 becomes the coastal route into Virginia, where US 13 takes over.
Though US 1 is generally considered to be the highway that runs alongside Interstate 95, US 17 runs parallel to I-95 for much of its extent, and even shares the same physical road for short spans in Fredericksburg and Ridgeland.

U.S. Route 13

US 13DuPont Parkway13
North of Jacksonville, US 1 turns northwest towards Augusta, Georgia; US 17 becomes the coastal route into Virginia, where US 13 takes over.
It follows the Atlantic coast more closely than does the main north–south U.S. highway of the region, U.S. Route 1.

U.S. Route 220

US 220U.S. 220220
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.
The highway extends for 680 mi from an intersection with US 1 in Rockingham, North Carolina, to its interchange with New York State Route 17 (NY 17; future Interstate 86 or I-86) in South Waverly, Pennsylvania.

Palm Coast, Florida

Palm CoastFlorida
US 1 travels along the east coast of Florida, beginning at 490 Whitehead St. in Key West and passing through Miami, Hollywood, Fort Lauderdale, Boca Raton, West Palm Beach, Jupiter, Fort Pierce, Melbourne, Cocoa, Titusville, Daytona Beach, Palm Coast, St. Augustine, and Jacksonville.
U.S. Route 1 runs parallel to I-95 through the western side of Palm Coast, leading into Bunnell.

Aiken, South Carolina

AikenAiken, SCAiken (SC) Silver Bluff
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.
It is 20 mi northeast of Augusta, Georgia, along U.S. Route 1 and 78.

Swainsboro, Georgia

SwainsboroSwainsboro, GA
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.
U.S. Route 80 passes through the center of the city, and U.S. Route 1 bypasses it to the west.

Fort Pierce, Florida

Fort PierceFt. PierceFort Pierce, FL
US 1 travels along the east coast of Florida, beginning at 490 Whitehead St. in Key West and passing through Miami, Hollywood, Fort Lauderdale, Boca Raton, West Palm Beach, Jupiter, Fort Pierce, Melbourne, Cocoa, Titusville, Daytona Beach, Palm Coast, St. Augustine, and Jacksonville.
Fort Pierce is located on U.S. Route 1, near its intersection with Florida Route 70.

Camden, South Carolina

CamdenColonial CupCamden, Kershaw County
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 intersects with US 521 and 601 in downtown; leading 30 miles southwest to the state capital, Columbia and 55 miles northeast to Cheraw.

Jefferson Davis Highway

Jefferson Davis Memorial HighwayRichmond HighwayJefferson Davis National Highway
US 1 continues with the Jefferson Davis Highway label through Lee County and Sanford, and on to Cary and Raleigh.
What is known is that when numbered highways came into existence, the Jefferson Davis National Highway was split among US 1, US 15, US 29, US 61, US 80, US 90, US 99, US 190 and others.

Patrick, South Carolina

Patrick
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.
U.S. Route 1 passes through the town, leading northeast 13 mi to Cheraw and southwest 15 mi to McBee.

Atlantic Seaboard fall line

Fall LineFall Line regionFall Line Road
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. 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.
U.S. Route 1 links many of the fall line cities.

14th Street bridges

14th Street BridgeLong BridgeHighway Bridge
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.
The complex contains three four-lane automobile bridges—one northbound, one southbound, and one bi-directional — that carry Interstate 395 (I-395) and U.S. Route 1 (US 1) traffic.

McBee, South Carolina

McBee
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.
U.S. Route 1 passes through the center of town, leading southwest 27 mi to Camden and northeast 28 mi to Cheraw.

Northeast megalopolis

NortheastNortheast CorridorNortheastern Megalopolis
In the Mid-Atlantic region, US 1 generally serves some of the most populated areas of the east coast.
It is linked by Interstate 95 and U.S. Route 1, which start in Miami and Key West, Florida, respectively, and terminate in Maine at the Canada–United States border, as well as the Northeast Corridor railway line, the busiest passenger rail line in the country.

U.S. Route 58

US 58SR 12State Route 12
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.
The route crosses US 1 and Interstate 85 in South Hill, followed by Interstate 95 in Emporia.

East Coast of the United States

East CoastEastern SeaboardAtlantic Coast
U.S. Route 1 (US 1) is a major north–south U.S. Highway that serves the East Coast of the United States.
The primary Interstate Highway along the East Coast is Interstate 95, completed in 2018, which replaced the historic U.S. Route 1 (Atlantic Highway), the original federal highway that traversed all East Coast states, except Delaware.

U.S. Route 1 in Massachusetts

U.S. Route 1US 1U.S. 1
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.
In the U.S. state of Massachusetts, U.S. Route 1 (US 1) is a major north–south highway through Boston.

Cheraw, South Carolina

CherawCheraw District, South CarolinaCheraw, SC
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.
U.S. Route 1 passes through the center of the town, leading northeast 21 mi to Rockingham, North Carolina, and southwest 55 mi to Camden.

Newburyport, Massachusetts

NewburyportNewburyport, MANewbury
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.
The Newburyport Turnpike (U.S. Route 1) still traverses Newburyport on its way north.

U.S. Route 1 Bypass (Portsmouth, New Hampshire–Kittery, Maine)

U.S. Route 1 BypassUS 1 BypassBypass
During construction, drivers had to detour to one of two other nearby bridges carrying U.S. Route 1 Bypass or Interstate 95.
U.S. Route 1 Bypass (US 1 Byp.) is a 4.3 mi bypass of U.S. Route 1 in Portsmouth, New Hampshire and Kittery, Maine.

Boston Post Road

Boston RoadPost RoadOld Post Road
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.
The three major alignments were the Lower Post Road (now U.S. Route 1 (US 1) along the shore via Providence, Rhode Island), the Upper Post Road (now US 5 and US 20 from New Haven, Connecticut by way of Springfield, Massachusetts), and the Middle Post Road (which diverged from the Upper Road in Hartford, Connecticut and ran northeastward to Boston via Pomfret, Connecticut).

Interstate 93

I-93Southeast Expressway93
When it reaches Dedham, US 1 turns east, overlapping I-95 and I-93 east to Braintree and north through Downtown Boston.
At this junction, I-95 North heads to the northwest (co-signed with U.S. Route 1 South, as well as Route 128, which begins at the interchange), to serve as the beltway around Boston, while I-95 South runs by itself southwest through Boston's southwestern suburbs toward Rhode Island.

Memorial Bridge (Portsmouth, New Hampshire)

Memorial Bridge
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 Memorial Bridge, which was demolished and replaced during 2012–13, leaving a temporary gap in US 1.
The World War I Memorial Bridge is a vertical-lift bridge that carries U.S. Route 1 across the Piscataqua River between Portsmouth, New Hampshire, and Badger's Island in Kittery, Maine, United States.

Trenton–Morrisville Toll Bridge

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.
Opened in 1952, it carries U.S. Route 1 (US 1) and is owned and operated by the Delaware River Joint Toll Bridge Commission.