Data shown represents International Roughness Index or IRI, a standardized pavement measurement indicating the overall smoothness of a roadway.

Sources

Questions or comments? Email Brandon Flessner

Miles of Highway by Condition

Show highways with an IRI value between ...

0 - 775


International Roughness Index (IRI)

CategoryIRI Range
Poor 170 or higher
Fair 95 - 170
Good 0 - 95