Brought to you by AARoads, included on this site are guides for all Interstate highways within the Eisenhower Interstate System. The national network of freeways and toll roads includes a number of transcontinental routes, many urban expressways, officially designated scenic byways and engineering marvels. Construction and maintenance projects continuously increase capacity, addresses safety issues and modernizes infrastructure. The system is not done expanding, as newer corridors are developed with Congressional authority.
Designated in 1956, the Eisenhower Interstate System includes over 46,000 miles with routes in each of the 50 states and the U.S. Territory of Puerto Rico. The Federal-Aid Highway Act of 1956 specified a limit of 41,000 miles to be built with Interstate Construction funds. Legislation eventually increased that limit to 43,000. Other legislation allows the Federal Highway Administration (FHWA) to approve additional mileage for freeways adhering to Interstate standards that would be a logical addition or connection. These routes are considered not chargeable, meaning they are not eligible for Interstate Construction funds under the 1956 Act.