Final answer:
Headrests are pre-positioned for safety during collisions to prevent injuries, not for resting purposes.
Explanation:
Head rests are pre-positioned at the factory and do not require adjustment because their purpose is to prevent injury, not for resting. They provide the force needed to accelerate the head along with the body during a collision, keeping the neck in a safe position.
You can observe the importance of headrests in crash-test videos, where they help maintain proper head positioning in the event of a rear-end collision, reducing the risk of neck injuries.
Learn more about Safety features of headrests in cars here:
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