A united effort by state and federal agencies to save more lives.

American Association of State Highway and Transportation Officials
444 N Capitol St NW
Suite 249
Washington DC, 20001

Governors Highway Safety Association

Federal Highway Administration

National Highway Traffic Safety Administration

Transportation Research Board of The National Academies

National Cooperative Highway Research Program

Implementation Guides

« Back to Implementation Guides

Volume 06: A Guide for Addressing Run-Off-Road Collisions


39 Percent of Fatal Crashes Involve Leaving the Roadway


Run-Off-Road (ROR) crashes involve vehicles that leave the travel lane and encroach onto the shoulder and beyond and hit one or more objects.  Nearly 4 of every 10 fatal motor vehicle crashes—well over 14,000 a year—involve a single vehicle leaving the roadway. There are more than twice as many ROR fatal crashes on rural roads than on urban roads. Some 42 percent of ROR fatal crashes occur on curves (50 percent in rural areas). And the life-threatening events most likely to occur are rollovers (42 percent) and collisions with trees (25 percent).



  • Keep vehicles from encroaching on the roadside.
  • Minimize the likelihood of crashing into an object or overturning if the vehicle travel   beyond the shoulder of the road.
  • Reduce the severity of crashes.

Download this guide: http://gulliver.trb.org/publications/nchrp/nchrp_rpt_500v6.pdf

NCHRP 500-6
Run-Off-Road Collisions

This guide addresses reducing the likelihood that a vehicle will leave the roadway through roadway design, or if the vehicle does leave the road, then minimizing crashing or overturning; and if not, then by minimizing the severity of a crash.

Download the guide in PDF

View the Guide and Appendices in HTML

Order a printed copy

Related publications


Run-Off-Road One Pager


Self Assessment Tool


Integrated Safety Management Process