passive restraint system

A passive restraint system is a safety feature for vehicles that is designed to protect occupants during a collision without requiring action by the driver or passenger. Examples include airbags, automatic seat belts, seat belt pretensioners, head restraints, and knee bolsters that deploy, engage, or otherwise function automatically. These systems are meant to help reduce injuries and prevent occupants from striking the vehicle interior or being ejected. Auto insurance underwriters may consider passive restraint systems as part of their rating process, taking into consideration that they can reduce the severity of injury claims.