What best describes passive safety devices?

The description of passive safety devices as "always on devices for safety" accurately captures their primary function in vehicle safety systems. Passive safety devices are designed to provide protection to occupants in the event of a collision without requiring any action from the driver or passengers. These devices operate automatically and continuously work to reduce the potential for injury when an accident occurs.

For example, airbags, seat belts, and crumple zones are considered passive safety devices because they engage automatically during a crash to absorb impact and protect those inside the vehicle. They do not rely on the driver's input or intervention, which distinguishes them from active safety systems that require the driver to take specific actions to prevent accidents.

In contrast to other descriptions, some options suggest that passive safety devices are only effective in certain scenarios or depend on driving behavior, which is not accurate. The essence of passive safety is that these systems are always in place, ready to activate when needed, without any action from the vehicle's occupants.