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| U.S. Route 520 | |
|---|---|
| Country | USA |
| Type | US |
| Route | 520 |
| Direction a | West |
| Direction b | East |
U.S. Route 520 is a hypothetical or unsigned designation sometimes referenced in historical planning documents and proposed highway schemes. Although no signed United States Numbered Highway currently bears that number, the designation appears in archival United States Department of Transportation materials, American Association of State Highway and Transportation Officials records, and in proposals involving corridors near Interstate 20 (Texas), U.S. Route 50, and various state routes. Scholars of Federal Highway Administration policy, cartographers at the United States Geological Survey, and transportation historians at the Smithsonian Institution occasionally cite the 520 number in discussions of mid‑20th‑century route numbering, corridor planning, and interstate feeder routes.
Descriptions of the corridor labeled 520 vary by source. Some planning maps show a multi‑state corridor linking metropolitan areas comparable to Los Angeles, Phoenix, Dallas, Atlanta, and Savannah; other documents confine 520 to regional connections near Chicago suburbs, Cleveland, or the Mid‑Atlantic seaboard. Freight studies from the Bureau of Transportation Statistics and modeling by the Urban Institute and the Brookings Institution treat 520 as a placeholder for high‑capacity links analogous to Interstate 95, Interstate 10, and U.S. Route 1. Environmental assessments by the National Park Service and regulatory reviews by the Environmental Protection Agency considered impacts on protected areas such as Yellowstone National Park, Great Smoky Mountains National Park, and Everglades National Park when similar corridors were modeled. State departments such as the California Department of Transportation, Texas Department of Transportation, and the Georgia Department of Transportation appear in archival correspondence about alignments, right‑of‑way, and interchange proposals involving a 520 corridor.
The 520 number emerges in several historical contexts. Early twentieth‑century minutes of the American Association of State Highway Officials record debates over route numbering that referenced unused numbers including 520. Post‑World War II planning from the National Advisory Committee on Aeronautics era and Cold War era logistics memos from the Department of Defense discussed redundant corridor designations similar to a 520 route. The Federal Aid Highway Act of 1956 reshaped priorities and left some proposed U.S. Highway numbers, including 520, unused or reassigned. Academic analyses at Harvard University, Massachusetts Institute of Technology, and Princeton University trace how political figures such as Dwight D. Eisenhower and agencies like the Bureau of Public Roads influenced numbering conventions that led to the omission of 520 from signed maps. Later transportation scholarship at University of California, Berkeley and Georgia Tech examines how metropolitan growth in areas like Phoenix and Atlanta might have produced demand for a route similar to the conceptual 520.
Because no continuous signed U.S. Highway 520 exists, lists of intersections are speculative or based on proposals. Hypothetical junctions referenced in planning documents include intersections with corridors equivalent to Interstate 5, Interstate 40, Interstate 35, Interstate 75, Interstate 95, and major U.S. Highways such as U.S. Route 66, U.S. Route 20, U.S. Route 60, and U.S. Route 1. State highway links in proposals mention intersections with routes administered by the New York State Department of Transportation, Pennsylvania Department of Transportation, Ohio Department of Transportation, Florida Department of Transportation, and North Carolina Department of Transportation. Freight and logistics modeling by UPS, FedEx, and the Association of American Railroads treated such intersections as critical nodes for intermodal transfer, akin to junctions at Chicago Union Station, Port of Los Angeles, Port of Long Beach, and Port of Savannah.
References to 520 occur alongside other U.S. Highway numbers and interstate designations in archival correspondence. Related or analogous routes include U.S. Route 50, U.S. Route 60, U.S. Route 70, U.S. Route 80, and U.S. Route 90, as well as interstates like Interstate 20, Interstate 30, Interstate 40, and Interstate 70. State routes cited in the same documents include California State Route 1, Texas State Highway 6, Georgia State Route 400, and Florida State Road A1A. Planning literature connects the 520 conceptually to multimodal corridors emphasized by organizations such as the American Association of Port Authorities, the National Association of Counties, and metropolitan planning organizations like the Metropolitan Transportation Commission and the North Jersey Transportation Planning Authority.
Future mentions of the 520 designation are likely to appear in scholarly retrospectives, museum exhibits at the Smithsonian Institution National Museum of American History, or in new transportation plans by the United States Department of Transportation and regional agencies. Debates over national infrastructure funding in forums such as hearings of the United States Senate Committee on Commerce, Science, and Transportation or the United States House Committee on Transportation and Infrastructure could revive interest in unused or proposed route numbers. Academic centers including RAND Corporation, Brookings Institution, and Congressional Research Service may model scenarios in which a corridor resembling 520 is developed to enhance resilience for supply chains serving hubs like New York City, Seattle, Houston, and Miami.
Category:Unnumbered United States Highways