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A seat belt 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). Seat belts are considered primary restraint systems (PRSs), because of their vital role in occupant safety.
Child held in a car seat by a five-point harness. A five-point harness is a form of seat belt that contains five straps that are mounted to the car frame. It has been engineered for an increase of safety in the occurrence of an automobile accident. As a result, this form of seat belt has been mandated in the race car competition of NASCAR. [1]
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Dependent on an airline's choice of installation, airplane airbags are most often installed in First class, Business class, Premium Economy, and Economy bulkhead/exit row seats. The use of seat belt extenders deactivates the airbag mechanism, so some airlines require seat belt extender users to be reassigned to seats without airbags.
The US National Highway Traffic Safety Administration says that the seat belt saves about 15,000 lives per year in the US. [ 3 ] In addition to designing an effective three-point belt, Bohlin demonstrated its effectiveness in a study of 28,000 accidents in Sweden, and presented a paper at the 11th Stapp Car Crash Convention.
Automatic belts were a cheaper form of passive restraints rather than an airbag. File:Automatic seat belt.jpg. Simple automatic belt systems cost $50-$200 less than airbag systems. The first to sell automatic seat belts was Volkswagen, with the 1975 VW Rabbit, which had a door-mounted automatic shoulder belt (BUT NO LAP BELT).
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Predominantly, 'Failed Barriers' are considered. These are the barriers that should have prevented the incident but failed for various reasons. For example, a barrier to prevent injury in a car is a seat belt; however, this barrier may fail because the driver did not wear a seat belt, or the seat belt mechanism itself was faulty.