Sources
1. U.S. Department of Transportation, Hazardous Materials Information System database, 2000, available at http://hazmat.dot.gov, as of Mar. 12, 2001.
2. U.S. Department of Transportation, Research and Special Programs Administration, Biennial Report on Hazardous Material Transportation Calendar Years 1992–1993 (Washington, DC: 1995).

Transportation Workers
Occupational risk from transportation incidents is often overlooked in safety analyses. The U.S. Department of Labor, Bureau of Labor Statistics collects data using the Census of Fatal Occupational Injuries. These data classify occupational deaths by event or type of exposure, one of which is “transportation incidents.” Transportation incidents are further classified into three additional levels of detail (e.g., highway incident/noncollision/jackknifed vehicle).