What should a school bus driver do with the bus's danger lights (hazard lights) while stopped at a railroad crossing, according to common procedure?

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1. Only the headlights need to be used at the crossing, with no other lights involved, so the bus is visible to the train
2. Turn off all lights completely while stopped at the crossing
3. Hazard lights are never used at a railroad crossing stop
4. Activate them to alert traffic behind the bus that it is stopped, following the specific procedure required

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