CTRE is an Iowa State University center, administered by the Institute for Transportation.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

Website: www.ctre.iastate.edu/

Iowa State University--Becoming the Best

US Road Assessment Program, Phases 1-3

Color-coded Iowa road map showing crash rates

usRAP Iowa map of crash rate on rural primary roads


Principal investigators:

Co-principal investigators:

Project status


Start date: 05/01/04
End date: 12/31/08


Project webpage: http://www.usrap.us/home/




About the research


As part of a larger study, CTRE conducted a pilot program in Iowa to assess the feasibility of a US Road Assessment Program (USRAP). Based on EuroRAP concepts, the usRAP pilot studies have tested two potential protocols for safety assessment and mapping of roadway systems. These are 1) risk mapping to document the risk of death and serious injury crashes and show where risk is high and low and 2) star ratings based on inspection of roads to examine how well they protect users from crashes and from deaths and serious injuries when crashes occur. CTRE has continued work on phases 2 and 3. See the usRAP website above for more information.