| National Highway System | |
|---|---|
&sq=Google&lang=en&file=File:National_Highway_System.jpg) 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 | |
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.