Box A: Roadway Profiles

In FARS, roadways that fatal crashes occur on are assigned one of five profiles:

1. Grade a sloped roadway
2. Level a flat roadway
3. Hill crest the top of a hill
4. Sag a drop in the roadway
5. Unknown

SOURCE: U.S. Department of Transportation, National Highway Traffic Safety Administration, FARS Analytic Reference Guide 1975-2008 (http://www-nrd.nhtsa.dot.gov/Pubs/811137.PDF)