Figure 7. Fatalities in Combination Truck, Single-Unit Truck, and Passenger Vehicle Crashes
per 100 Million Vehicle Miles Traveled, 1975-2005
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).