For the headrest to be correctly adjusted, the distance to the head should be...
Active and passive safety
Explanation
To ensure the **headrest** is correctly adjusted, it is crucial that the distance between your head and the headrest is the **minimum possible**, and it should never exceed **4 centimeters**. This is because the headrest is a **passive safety device** designed to protect the neck and cervical spine in the event of a sudden impact.
- The top of the headrest should be at the same height as the top of your head. This ensures that, in the event of an impact, the headrest can offer maximum support and protection to the cervical spine, preventing serious injuries.
- Maintaining an appropriate distance, that is, **4 centimeters or less**, is essential for the headrest to perform its function effectively. A greater distance could reduce its effectiveness in the event of an accident.
Therefore, adjusting the headrest correctly is a vital safety measure that should not be based on comfort, but on the protection it offers.
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