Official Driving School Segment 1 Practice Test

Head restraints are meant to limit how far the head can move backward in a crash, reducing whiplash and other neck injuries. When properly adjusted, the restraint should sit directly behind and as close as possible to the middle of the back of your head. This position provides solid support for the head and keeps it aligned with the spine, so the force of a rear impact is absorbed more safely.

If the restraint were in front of the head, it wouldn’t support the head at all. If it’s too far away, it can’t stop the head from snapping backward effectively. If it’s placed too high or misaligned, it may not support the head where it’s needed, which can also reduce protective benefit.