What is the proper positioning of the lap portion of a three-point safety seat belt?
Answer and explanation
Correct answer: B. Snug across the strong pelvic bones, never over the soft abdomen
- Step 1: Seat belt biomechanics. Step 2. Lap belt must rest low over the pelvis (iliac crests); placing over the abdomen causes fatal internal bleeding in a crash. Answer: Snug across the strong pelvic bones, never over the soft abdomen. Why not the others: Loose over abdomen crushes organs; under thighs allows submarining; twisted belts concentrate impact force dangerously.
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