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Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)
U.S Department of Transportation
Updated Oct 25, 2026
About this dataset
Annual road length by measured pavement roughness using the IRI (International Roughness Index) by functional class for the 50 states, DC, and PR from the Highway Statistics Series table HM-64. Note: Missing 2010 and 2021,
Data and resources (3)
- CSV
Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)
Modified Oct 25, 2026Table and Data API available
- JSON
Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)
Modified Aug 25, 2026
- XSL
Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)
Modified Aug 25, 2026