Which of the following is commonly described as a primary occupant restraint system?

• A. Seat Cushions
• B. Headrests
• C. Airbags
• D. Seat Belts

Answer: (D)

The main idea is that the primary occupant restraint is the device that directly and most effectively limits how far a person can move during a crash. Seat belts do this by securing the occupant to the vehicle, restricting forward and lateral movement, and distributing crash forces across stronger parts of the body. They keep the occupant in the correct position so other safety systems, like airbags, can do their job more effectively.

Headrests mainly protect against whiplash by limiting rearward head motion, not by restraining the body in a crash. Airbags act as a supplemental or protective feature that reduces impact forces, but they rely on the seat belt to position the occupant properly and don’t themselves prevent the initial forward movement. Seat cushions provide support and orientation but do not restrain movement in a crash the way seat belts do.

So the device commonly described as the primary occupant restraint system is the seat belt.