Figure 7. Fatalities in Combination Truck, Single-Unit Truck, and Passenger Vehicle Crashes
per 100 Million Vehicle Miles Traveled, 1975-1999

Note: A combination truck is defined as a truck tractor pulling any number of trailers (including none) or a straight truck pulling at least one trailer. A single-unit truck is defined as a medium or heavy truck in which the engine, cab, drive train, and cargo area are all on one chassis. A passenger vehicle is defined as a car or light truck (including pickups, vans, and sport utility vehicles).
Sources: Vehicle Miles of Travel: Federal Highway Administration. Fatal Crashes, Vehicles Involved, and Fatalities: National Highway Traffic Safety Administration, Fatality Analysis Reporting System (FARS).