Why should head rests be adjusted properly?

Proper adjustment of headrests is vital primarily for safety, specifically to prevent neck injuries in the event of a rear-end collision. When the headrest is positioned correctly, it should be at a height that supports the back of the head and aligns with the driver's neck. This positioning minimizes the distance between the head and the headrest, thereby reducing the potential for whiplash or other neck injuries if the vehicle is struck from behind.

In contrast, enhancing comfort is a secondary consideration and does not capture the primary safety purpose behind headrest adjustment. Similarly, while visibility and head support during sleep may provide benefits, they are not the primary functions of a headrest in a vehicle. The main focus for headrests lies in accident prevention and reducing the severity of injuries during crashes.