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U.S. Public Road and Street Mileage by Functional System(a)
A public road is any road under the ownership of and maintained by a public authority (federal, state, county, town or township, local government or instrumentality thereof) and open to public travel. No consistent data on private road mileage is available. For more detailed information, including breakouts of mileage by ownership and type of surface, see the source document.
From 2005 to 2009, approximately 4,394 miles of federal agency and local government owned roads are excluded; 71 miles of other non-Federal agency owned roads are excluded; and 274 miles of miscoded non-Interstate functional system length or rural/urban categorization or both are included.
KEY: U = data are not available.
a Includes the 50 states and the District of Columbia. When states did not submit reports, data was estimated by the U.S. Department of Transportation, Federal Highway Administration.
1990-2017: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: Annual Issues), table HM-220, available at http://www.fhwa.dot.gov/policyinformation/statistics.cfm as of Dec. 12, 2018.