Baselight is shutting down June 30.
Export any data that you want to keep. Read the announcement.
Department of Transportation
Dataset Description
Annual road miles by functional system (National Highway System, other Federal-aid highways, and non-Federal-aid highways) and state for the 50 states, DC, and PR from the Highway Statistics Series table HM-15. Note: Missing 2009 and 2021.
Organization: Department of Transportation
Organization URL: https://catalog.data.gov/organization/dot
Last updated: 2026-04-23
Tags: functional system, highway statistics, hppi, roadways