U.S. Route 40

U.S. Route 40
State	US
Type	US
Route	40
Length mi	approx 2,286
Established	1926
Direction a	West
Terminus a	Silver Summit, Utah
Direction b	East
Terminus b	Atlantic City, New Jersey
States	Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, New Jersey

U.S. Route 40 is a major east–west United States Numbered Highway that traverses the continent from the high desert near Salt Lake City to the Atlantic shore at Atlantic City, New Jersey. Established in 1926, the highway connects a succession of historical corridors, urban centers, and transportation nodes including Denver, Kansas City, Missouri, St. Louis, Indianapolis, Columbus, Ohio, Pittsburgh, and Baltimore. U.S. Route 40 overlays or parallels earlier routes such as portions of the National Road, segments associated with the Lincoln Highway, and alignments tied to 19th-century wagon routes and turnpikes like the Vandalia Line.

Route description

The western end begins near Silver Summit, Utah east of Salt Lake City and proceeds through the Rocky Mountains corridor approaching Denver, Colorado, where it intersects interstate routes including Interstate 80 and Interstate 25. Across Kansas the route passes near Topeka and Lawrence, Kansas before entering the Missouri metroplex of Kansas City, Missouri and continuing along corridors that serve St. Louis, intersecting with Interstate 70 and linking with crossings of the Mississippi River such as the Chain of Rocks Bridge. In Illinois and Indiana the highway serves suburban and rural communities outside Chicago influence, threading through Effingham, Illinois and into Indianapolis, where it converges with historical arteries like the Lincoln Highway and meets Interstate 65. Entering Ohio, the corridor traverses Dayton, Columbus, Ohio, and Zanesville, intersecting with U.S. Route 23 and U.S. Route 6. In West Virginia and western Pennsylvania the highway negotiates Appalachian valleys near Wheeling, West Virginia and Pittsburgh, where it connects to riverfront districts such as Point State Park. Eastward through Pennsylvania it passes near Harrisburg, Lancaster, Pennsylvania, and Philadelphia, then crosses into New Jersey to terminate at Atlantic City, New Jersey on the Atlantic Ocean shoreline.

History

The highway’s 1926 designation formalized a cross-country alignment influenced by earlier federal projects such as the National Road commissioned by the United States Congress and executed during the administrations of presidents including James Monroe and Andrew Jackson. Segments of the route incorporate 19th-century turnpikes like the Baltimore and Ohio Railroad right-of-way parallels and stages of the Lincoln Highway planning debates involving figures such as Carl G. Fisher. Throughout the 20th century, U.S. Route 40 was realigned and truncated in response to the construction of the Interstate Highway System, especially Interstate 70 and Interstate 80, guided by agencies including the American Association of State Highway Officials and the Federal Highway Administration. Key historical moments include wartime mobilization connections to Fort Knox, New Deal-era improvements under the Works Progress Administration, and midcentury traffic patterns that shaped urban renewal projects in cities like Baltimore and St. Louis. Preservation efforts later involved entities such as the National Park Service and state historic preservation offices to recognize portions related to the National Road and other heritage corridors.

Major intersections and termini

Major western termini and intersections include the junction near Salt Lake City with Interstate 80 and the interchange with Interstate 70 approaching Denver. In the Midwest, the route meets Interstate 35 and U.S. Route 71 around Kansas City, Missouri, and major river crossings at Missouri River and Mississippi River points near St. Louis and the Great River Road. In Indiana and Ohio the highway intersects Interstate 65, Interstate 70, Interstate 75, and regional corridors such as U.S. Route 23. In Pennsylvania and New Jersey the route links with Interstate 76 near Philadelphia, U.S. Route 1, and eastern coastal connections to Atlantic City, New Jersey. Historic termini and notable junctions recall links to rail hubs like Union Station (Kansas City), ports such as Port of Baltimore, and aviation nodes like Denver International Airport planning predecessors near Stapleton International Airport.

Auxiliary and special routes

A series of suffixed and auxiliary alignments have existed including business loops through downtowns such as Columbus, Ohio and Lancaster, Pennsylvania, truck routes bypassing urban restrictions, and alternate alignments created by state departments of transportation in Missouri, Illinois, and Pennsylvania. Notable examples include business spur designations serving historic main streets in towns like Cumberland, Maryland and Zanesville, Ohio, plus special bridge approaches at crossings like the Fort Pitt Bridge and the Benjamin Franklin Bridge region. State route partners include Maryland Route 144 as an older alignment, Pennsylvania Route 3 overlaps in suburban Philadelphia corridors, and routing coordination with New Jersey Route 42 into Camden County, New Jersey.

Cultural significance and landmarks

U.S. Route 40 traverses numerous cultural landmarks and heritage sites: sections of the National Road preserved at Braddock's Battlefield environs, industrial heritage districts in Pittsburgh and Youngstown, Ohio, and seaside resort culture at Atlantic City, New Jersey boardwalks linked to entertainment figures such as Frank Sinatra. The corridor links museums like the Smithsonian Institution-affiliated sites in Washington, D.C. planning contexts, the National Civil War Museum-adjacent areas in Harrisburg, and transportation museums such as the National Road Museum initiatives. Literary and musical references tie the route to American travel narratives associated with writers like John Steinbeck and performers who toured along the corridor, intersecting with festival sites like Lollapalooza-era city staging and historic fairgrounds such as the Ohio State Fair.

Future developments and improvements

Planned and prospective projects affecting the corridor involve state departments such as the Utah Department of Transportation, Colorado Department of Transportation, Missouri Department of Transportation, Ohio Department of Transportation, and New Jersey Department of Transportation coordinating with the Federal Highway Administration on capacity, safety, and preservation work. Initiatives include interchange reconstructions near Denver International Airport access routes, multimodal integration proposals tied to Amtrak corridors at stations like Denver Union Station and Philadelphia's 30th Street Station, and bridge rehabilitation programs for aging spans over the Ohio River and Mississippi River. Heritage designation efforts continue with organizations such as the National Trust for Historic Preservation and state historic preservation offices to protect segments associated with the National Road and to support tourism partnerships with entities like Visit Philadelphia and New Jersey Division of Travel and Tourism.

Category:United States Numbered Highways