From 1980 to 1990, safety-belt use among passenger-vehicle drivers in the United States increased from 11% to 49%; in 1990, use of safety belts prevented approximately 4800 deaths and 120,000 serious injuries among front-seat occupants (1). The increased use of safety belts from 1984 through 1990 was associated primarily with the enactment of state laws (Figure 1). In recent years, however, the...