District of Columbia Annual Average Daily Traffic Volumes

Traffic volume data for roadway blocks in Washington D.C., created by the District of Columbia Department of Transportation. Counts are collected bi-directionally on Highway Performance Monitoring System sections and converted to Annual Average Daily Traffic (AADT) values on a three-year cycle.

Use Cases

• Analyze Annual Average Daily Traffic (AADT) trends across different roadway blocks to identify congestion patterns.
• Model traffic flow using bi-directional count data from Highway Performance Monitoring System (HPMS) sections.
• Integrate traffic volume data with road network geometry from the provided GEOJSON or KML files for spatial analysis.

Strengths

• Data is collected on a defined three-year cycle, providing a structured update schedule.
• Includes multiple geospatial file formats like GEOJSON and KML for direct mapping and analysis.
• Published under a permissive CC-BY license, allowing for broad reuse and distribution.

Limitations

• The specific row count, column names, and temporal range of the data are not provided in the input.
• Data coverage is limited to the District of Columbia, not representative of broader regional or national traffic.

Provenance

Source

District of Columbia Department of Transportation (DDOT) Roads and Highways database.

Collection Method

Traffic counts collected bi-directionally at pre-selected locations on HPMS sections and converted to AADT.

Time Range

null

Freshness

Last updated February 2026, indicating recent maintenance.

Geography

District of Columbia (Washington D.C.), United States.