National Highway System Pavement Condition

percent of NHS facility miles
Loading...

Poor: IRI > 170

Fair: IRI 95 - 170

Good: IRI < 95

Notes:

Pavement condition is measured by the International Roughness Index (IRI) which takes a longitudinal profile of pavement roughness based on one-way facility centerline miles. A lower IRI indicates smoother highway conditions and a higher IRI indicates rougher highway conditions.

Sources:

Source: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics, table HM-47, available at https://www.fhwa.dot.gov/policyinformation/statistics.cfm/.

Last Updated: December 2017