Pavement distress: IRI, rutting, faulting, percent cracking, surface type, and present serviceability rating are required to be collected and reported annually on the interstate highways and biennially on the non-interstate NHS and sample sections.
Traffic: Traffic counts are required on the NHS and sample sections at minimum every three years. All remaining federal-aid highways are required to be counted at least every six years.
All other data: All other data is to be updated as roadway conditions change.