National Highway System (United States)

National Highway System
National Highway System
	System map with Interstate Highways in blue and other components in red
System information
Length	160,955 mi (259,032 km)
Formed	November 28, 1995
Highway names
Interstates	Interstate nn (I-nn)
US Highways	U.S. Highway nn, U.S. Route nn (US nn, US-nn)
State	Varies by state
County roads	County Road nn, County Route nn (CR nn, Co. Rd. nn)
Other local roads	Varies by locality
System links
	National Highway System; Interstate; STRAHNET;

The National Highway System (NHS) is a network of strategic highways within the United States, including the Interstate Highway System and other roads serving major airports, ports, military bases, rail or truck terminals, railway stations, pipeline terminals and other strategic transport facilities. Altogether, it constitutes the largest highway system in the world.

Individual states are encouraged to focus federal funds on improving the efficiency and safety of this network. The roads within the system were identified by the United States Department of Transportation (USDOT) in cooperation with the states, local officials, and metropolitan planning organizations (MPOs) and approved by the United States Congress in 1995.