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Seat belt
A seat belt, also known as a safety belt, is a vehicle safety device designed to secure the occupant of a vehicle against harmful movement that may result during a collision or a sudden stop. A seat belt functions to reduce 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. When driving, the driver and passengers are travelling at the same speed as the car. If the car suddenly stops or crashes, the driver and passengers continue at the same speed the car was going before it stopped. A seatbelt applies an opposite force to the driver and passengers to prevent them from falling out or making contact with the interior of the car.
Seatbelts are considered as Primary Restraint Systems (PRS) as they play a vital role in occupant safety.
==Efficacy==
The use of a (modern) seat belt reduces an individual’s chance of fatality in a car crash by about 50%〔''Injury Prevention and Control: Motor Vehicle Safety''. (2014). Retrieved from http://www.cdc.gov/Motorvehiclesafety/seatbelts/facts.html〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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