When adjusting the driver’s seat backrest, what space should remain between it and the upper part of the back?
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Explanation
To drive in a **comfortable and safe** manner, it is important to correctly adjust the driver's seat backrest. The proper posture implies that the **back is completely supported by the backrest** of the seat, without leaving any space between the upper part of the back and the backrest. This ensures that the driver can react quickly and efficiently to any unforeseen events on the road.
- **There should be no space** between the upper part of the back and the backrest. This prevents the driver from having to lean forward, which could be dangerous and cause fatigue.
- Keeping the back well supported helps avoid the need to strain the body to reach the vehicle's controls, contributing to safer and less tiring driving.
Therefore, the correct answer is that **there should be no space** between the backrest and the upper part of the driver's back.
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