What factor might undermine seat belt functioning and efficiency whilst driving?
- Correct answer: Exaggerated backward tilting of the seat’.
- Driving on a rough road.
- Driving while wearing few layers of clothes which are too hot.
- Driver tiredness and sleepiness.
Why this is the answer
The correct answer in the official bank: Exaggerated backward tilting of the seat’.
A seat belt is designed to work when the occupant sits against a fairly upright seatback, with the strap lying across the shoulder, chest and pelvis. If the seat is tilted back too far, the shoulder strap stands away from the body, and in a crash the body can slide under the belt, injuring the abdomen or neck. Tiredness or a rough road are risky, but they don't stop the belt itself from working.