What is the alternate term for a supplemental restraint system (SRS)?

The term "supplemental restraint system" (SRS) refers to additional safety features in vehicles designed to work alongside primary restraints like seatbelts. Among the options provided, airbags are the most direct and accurate alternate term for SRS.

Airbags deploy in the event of a collision to provide additional protection to vehicle occupants, reducing the risk of injury. The designation as a "supplemental" system indicates that airbags are intended to complement (not replace) the use of seatbelts, enhancing overall safety during an accident.

Other options such as seatbelts and safety harnesses represent primary restraint systems that are always used in conjunction with airbags for optimal safety. Crash sensors, while related to the SRS, are the components that detect the severity and impact of a crash to trigger airbag deployment, rather than being an alternate term for the system itself. Therefore, airbags are the clear contextual link indicating the function and purpose of the supplemental restraint system.