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Question:

Do you need to stop before a railroad crossing if you are hauling 100 pounds of Division 4.3 materials?

A Yes.
Explaination

If your vehicle is placarded, you must stop from 15 to 50 feet from the nearest rail at a railroad crossing. After you have done this, proceed once you are sure that no train is approaching, and do not shift gears while you are on the tracks.