Figure 7. Fatalities in Combination Truck, Single-Unit Truck, and Passenger Vehicle Crashes per 100 Million Vehicle Miles Traveled, 1975-2009
Notes: 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).
The Federal Highway Administration implemented an enhanced methodology for estimating registered vehicles
and vehicle miles traveled by vehicle type for the years 2007-2009. As a result, involvement rates may differ,
and in some cases significantly, from previously published rates.
Sources: Vehicle Miles of Travel: Federal Highway Administration. Fatal Crashes, Vehicles Involved, and Fatalities: National Highway Traffic Safety Administration, Fatality Analysis Reporting System (FARS).