What is the main purpose of wearing a seatbelt?

Wearing a seatbelt is primarily intended to ensure safety in the event of a collision. The primary function of a seatbelt is to secure the occupant in their seat during an accident, minimizing the risk of injury or death. In a crash, unrestrained passengers can be thrown against the interior of the vehicle, ejected from the vehicle, or collide with other passengers, leading to severe injuries. Seatbelts help to absorb some of the force of a collision and keep the occupants positioned correctly in their seats, allowing the vehicle's safety features, such as airbags, to function as intended. This fundamental safety measure has been proven through extensive research to significantly decrease the likelihood of fatal injuries during vehicle accidents.