<Table> <Tr> <Td> </Td> <Td> This article's lead section may not adequately summarize key points of its contents . Please consider expanding the lead to provide an accessible overview of all important aspects of the article . Please discuss this issue on the article's talk page . (October 2013) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article's lead section may not adequately summarize key points of its contents . Please consider expanding the lead to provide an accessible overview of all important aspects of the article . Please discuss this issue on the article's talk page . (October 2013) </Td> </Tr> <P> A seat belt (also known as a seatbelt or 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 . </P> <P> When in motion, 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 opposing force to the driver and passengers to prevent them from falling out or making contact with the interior of the car . Seatbelts are considered Primary Restraint Systems (PRS), because of their vital role in occupant safety . </P>

Safety belt in a car is used because
find me the text answering this question