Samenvatting
This study was concerned with the actual use of seat belts by drivers observed when they passed a slow-moving panel truck in which the researchers rode. A total of 1.052 vehicles was observed, but final calculations were based on the 709 cases in which it was possible to judge definitely the age of the car, the registration of the car (in-state or out-of-state), the race and sex of the driver, and whether or not the driver wore a seat belt.