1-5 National Highway System Pavement Condition (Table)
percent of vehicle miles traveled
|Not acceptable||IRI > 170|
|Acceptable||IRI 95 – 170|
|Good||IRI < 95|
Note: Pavement condition is measured by the International Roughness Index (IRI).
Source: U.S. Department of Transportation, Federal Highway Administration, 2010 Status of the Nation's Highways, Bridges, and Transit: Conditions & Performance, available at www.fhwa.dot.gov/policy/2010cpr as of September 2013.