Why must most passenger-carrying vehicles come to a complete stop before certain railroad crossings, even if no train is visible?

Pick an answer

1. Stopping is required only at crossings without any gates or lights
2. The stop is required only as a formality with no real safety purpose
3. This requirement applies only to crossings with a visible warning signal present, since unmarked crossings are assumed to see less rail traffic
4. It gives the driver time to look and listen carefully in both directions before proceeding safely

Correct!

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