What is the primary purpose of a seatbelt?

The primary purpose of a seatbelt is to prevent ejection from the vehicle during a crash. Seatbelts are designed to secure the occupant in their seat, significantly reducing the risk of being thrown from the vehicle in the event of a collision. This is important because ejection from a vehicle is one of the most dangerous outcomes in a crash, often leading to severe injury or death. By keeping occupants securely in place, seatbelts help to ensure that they remain within the protective structure of the vehicle, which can be critical during an accident. This function contributes significantly to overall vehicle safety and has been shown by studies to reduce the likelihood of fatal injuries in crashes.