The purpose of the seat belt is to retain and protect the body in the event of a crash or rollover, preventing violent movements and impacts inside the vehicle or its projection to the outside.
In addition, its use in the rear seats prevents the occupants from causing serious injuries to those traveling in front of them in the event of an accident due it halves the chances of being fatal.
Its effectiveness has been fully demonstrated in all vehicle seats. In general, their proper use almost halves the probability of being killed in the event of an accident.