The range of fatality reduction for front seat passengers was broad, from 20% to 55%, as was the range of major injury, from 25% to 60%. Lives saved by seat belts and airbags in the United States, 1991–2001Īn analysis conducted in the United States in 1984 compared a variety of seat belt types alone and in combination with air bags. Seatbelts are considered primary restraint systems (PRSs), because of their vital role in occupant safety. A seatbelt applies an opposing force to the driver and passengers to prevent them from falling out or making contact with the interior of the car (especially preventing contact with, or going through, the windshield). If the vehicle suddenly stops or crashes, the occupants continue at the same speed the vehicle was going before it stopped. When in motion, the driver and passengers are traveling at the same speed as the vehicle. A seat belt reduces the likelihood of death or serious injury in a traffic collision by reducing the force of secondary impacts with interior strike hazards, by keeping occupants positioned correctly for maximum effectiveness of the airbag (if equipped), and by preventing occupants being ejected from the vehicle in a crash or if the vehicle rolls over. A seat belt (also known as a safety belt, or spelled seatbelt) is a vehicle safety device designed to secure the driver or a passenger of a vehicle against harmful movement that may result during a collision or a sudden stop.
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