When a vehicle breaks down and cannot move, the first step is to place a warning sign 50 to 150 meters behind the vehicle to prevent rear-end collisions.

ANSWER · B

This question tests the order of operations. Whether on an expressway or not, the first step is to turn on the hazard warning flashers, not to place warning signs. Turn on the hazard warning flashers first, then place warning signs within 50 to 100 meters behind the vehicle. PS: On an expressway, the warning sign should be placed 150 meters behind the vehicle.

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