What is considered the primary safety unit in a vehicle?

Seat belts are considered the primary safety unit in a vehicle because they are the first line of defense in protecting occupants during a collision. Their primary function is to restrain the occupants and prevent them from being ejected from the vehicle or colliding with the interior parts of the car during a crash. Seat belts work effectively when worn properly, helping to reduce the risk of serious injury or fatality in an accident.

While airbags also play a significant role in safety by providing additional cushioning and protection upon impact, they are designed to work in conjunction with seat belts rather than replace their use. Side impact beams enhance the structural integrity of the vehicle in the event of a collision but do not provide direct restraints for the occupants. Anti-lock brakes aid in vehicle control during braking but do not offer physical protection to passengers. Therefore, seat belts are recognized as the essential safety feature that provides critical protection to vehicle occupants.