All of the vehicles must stop before crossing railroad tracks because of the dangers present on the tracks.
What is a railroad tracks?
This refers to the structure on a railway that consists of the rails, fasteners, railroad ties ballast and underlying subgrade that enables the trains to move by providing a dependable surface for their wheels to roll upon.
While these vehicle are moving, they need to stop before crossing the railroad track in order to observe if there is any approaching train on the track.
Hence, all vehicles must stop before crossing railroad tracks because of the dangers present on the tracks.
Therefore, the Option C is correct.
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