National Highway System Roadways And Subsystems

August 2025 data from the Federal Highway Administration details the U.S. National Highway System, including its Interstate, Strategic Highway Network, and intermodal connector subsystems. The dataset is part of the National Transportation Atlas Database maintained by the Bureau of Transportation Statistics.

Use Cases

• Analyze the spatial distribution of Strategic Highway Network (STRAHNET) roadways for defense and emergency planning.
• Map connectivity between Interstate highways and Other Principal Arterials to assess national mobility infrastructure.
• Identify Major Strategic Highway Network Connectors linking military installations to the broader highway network.
• Evaluate the coverage and access points of Intermodal Connectors serving ports, airports, and transportation facilities.

Strengths

• Authoritative source from the U.S. Department of Transportation's Federal Highway Administration.
• Includes multiple defined subsystems (Interstate, STRAHNET, Connectors) for detailed categorical analysis.
• Updated in August 2025, providing current representation of the national highway network.

Limitations

• Unknown record count and file size limit assessment of dataset scale and manageability.
• Attribute details and column structure are not provided, requiring external data dictionary review.

Provenance

Source

Federal Highway Administration (FHWA), U.S. Department of Transportation.

Collection Method

Part of the National Transportation Atlas Database (NTAD); specific compilation method unknown.

Time Range

Snapshot as of August 2025.

Freshness

Updated August 2025.

Geography

United States.