What is the primary purpose of seat belts in passenger vehicles?

The primary purpose of seat belts in passenger vehicles is to keep occupants secure in their seats during a crash. Seat belts are designed to restrain the occupants of the vehicle, preventing them from being thrown forward or ejected from the vehicle in the event of a collision. This restraint significantly reduces the risk of injury or death by distributing the forces experienced during a crash across sturdier parts of the body, such as the chest and pelvis.

In addition to improving safety by keeping occupants in place, seat belts also work in conjunction with other safety features, such as airbags, to provide a comprehensive protective system within the vehicle. Their effectiveness has been well-documented, making seat belts one of the most important safety innovations in automotive history.