The National Highway System (NHS) is approximately 160,000 miles of roadway important to the nation's economy, defense, and mobility. The NHS includes the following subsystems of roadways.
NHS Interstate: The Eisenhower Interstate System of highways retains its separate identity within the
NHS Routes: These highways are secondary to the NHS Interstate, but still remain important to the national economy, defense and mobility.
NHS Intermodal Connectors: These highways provide access between major intermodal facilities and the other subsystems making up the National Highway System.
The NHS encourages transportation planners to focus on a limited number of high-priority routes and to concentrate on improving them with federal-aid funds. At the same time, states can incorporate design and construction improvements that address their traffic needs safely and efficiently.
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Last modified: April 26, 2012