How should the seat belt system be inspected?

The comprehensive inspection of the seat belt system is critical for ensuring passenger safety in a vehicle. The correct process involves checking for fraying, verifying functionality, and ensuring proper retraction of the seat belts. Fraying indicates wear and tear that could compromise the integrity of the seat belt, making it less effective in the event of an accident. Functionality includes assessing whether the buckle engages and releases smoothly, and whether the belt locks properly when pulled. Proper retraction ensures that the seat belt returns to its designated position and is ready for use, which is essential for both safety and convenience.

Focusing solely on retraction neglects the potential hazards posed by fraying and malfunctioning components, which could lead to failure during an emergency. Inspecting the color of the seat belts does not contribute to safety or effectiveness, as it does not impact their structural integrity or functionality. Ensuring a specific length is also unnecessary, as standard seat belts are designed to accommodate a range of body types; therefore, measuring the length does not meaningfully contribute to their safety. Thus, a thorough inspection involves all three elements highlighted in the correct approach.