How can the submarine effect be prevented?
- A)It is advisable to use clamps on the seat belts.
- B)You should use a towel or bead seat cover to prevent sliding.
- C)The seat belt must be properly adjusted, sit correctly, and avoid adding accessories to the seat.✓ Correct answer
Why this is the correct answer
The "submarine effect" is a dangerous phenomenon where, during a crash or hard braking, the occupant's body slides downward under the lap portion of the seat belt instead of being held in place. This happens when the belt is loose, poorly adjusted, or when objects like towels, cushions, bead seat covers, or belt clamps are placed between the body and the seat or belt. Options A and B are wrong because clamps and towel/bead covers actually INCREASE the risk of the submarine effect by creating gaps or altering the belt's tension. The correct answer is C: the seat belt must be properly tightened against the body, you must sit upright with the backrest nearly vertical, and no accessories should be added to the seat or the belt. This ensures the belt stays in contact with your pelvis and distributes crash forces correctly, preventing your body from sliding underneath.
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