Which statement best defines a passive restraint device?

Which statement best defines a passive restraint device?

• A. A system that deploys only after the crash is detected and allows the occupant to unfasten
• B. An automatic restraint device, such as an air bag, that does not require the occupant to fasten
• C. A device that rigidly locks the occupant in place to prevent movement
• D. A manually operated seat belt that requires the occupant to fasten

Answer: (B)

A passive restraint is one that activates automatically during a crash without any action from the occupant. Airbags are the classic example: they deploy in response to sensors and restrain the occupant without needing you to buckle up or do anything else. That’s why describing it as an automatic restraint that does not require the occupant to fasten fits best. Other choices imply some action by the occupant (like fastening) or describe a restraint that isn’t automatically engaged, which is not the defining feature of a passive system.

A passive restraint is one that activates automatically during a crash without any action from the occupant. Airbags are the classic example: they deploy in response to sensors and restrain the occupant without needing you to buckle up or do anything else. That’s why describing it as an automatic restraint that does not require the occupant to fasten fits best. Other choices imply some action by the occupant (like fastening) or describe a restraint that isn’t automatically engaged, which is not the defining feature of a passive system.