National Highway System (NHS)
Eric Wong – HPMS Branch Chief
Jessica Wang – NHS Coordinator
The National Highway System consists of roadways important to the nation’s economy, defense, and mobility. The National Highway System (NHS) includes the following subsystems of roadways (note that a specific highway route may be on more than one subsystem).
Interstate: The Eisenhower Interstate System of highways retains its separate identity within the NHS.
Other Principal Arterials: These are highways in rural and urban areas which provide access between an arterial and a major port, airport, public transportation facility, or other intermodal transportation facility.
Strategic Highway Network (STRAHNET): This is a network of highways which are important to the United States' strategic defense policy and which provide defense access, continuity and emergency capabilities for defense purposes.
Major Strategic Highway Network Connectors: These are highways which provide access between major military installations and highways which are part of the Strategic Highway Network.
Intermodal Connectors: These highways provide access between major intermodal facilities and the other four subsystems making up the National Highway System.
- Caltrans Web Map
- FHWA-NHS Web Map
- NHS Modification Procedures
- Code of Federal Regulations 23 CFR 470
- HPMS Field Manual
- Caltrans NHS GIS Dataset