What is the primary role of a seatbelt during a collision?

The primary role of a seatbelt during a collision is to prevent ejection from the vehicle. In the event of an accident, the momentum of a person inside the vehicle can cause them to be thrown from the car if they are not securely restrained. Seatbelts are designed to keep occupants safely confined within the vehicle, significantly reducing the risk of being ejected, which is a major factor in the severity of injuries sustained during a crash.

By holding the person in place and preventing ejection, seatbelts play a crucial role in improving overall safety. They are essential in maintaining occupants in a protected environment where safety features, such as airbags, can function effectively. While holding the driver in place and improving comfort are secondary benefits of seatbelts, their foam and design are primarily intended to secure passengers and protect them from being thrown from the vehicle during a collision.