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Question:

A railroad crossing is ahead of you and you are hauling hazardous material. When you stop for the crossing, you can stop as far away as _____ feet from the nearest rail.

A 50
Explaination

You must stop 15 to 50 feet before the nearest rail. Proceed only when you are sure no train is coming and you can clear the tracks without stopping. Do not shift gears while crossing the tracks.