Which of the following may indicate a railroad crossing?

A crossing signal system includes flashing red lights and may have a gate with red flashing lights that are activated when a train is nearby. Railroad crossings have pavement markings that include a large X with the letters RR. Only cross the tracks if you are sure you can completely clear the crossing.



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Although clear, simple signage may be sufficient for railroad crossings in sparsely inhabited regions, high-traffic intersections today often feature active warning systems, which include electrical boom gates, flashing lights, and warning bells that are triggered when an approaching train trips a nearby track circuit.

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A circular sign warns of a railroad crossing. The illustration below shows how the shape and color of a sign indicate the nature of the message.

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Railroad crossing signs are a yellow circle, with the letters and symbol in black. This sign is found before the crossing of a railroad, and may be accompanied with pavement markings.

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What Vehicles Must Stop At Railway Crossings?
  • School Buses. A school bus must stop if the driver sees a red light or hears an audible bell at all railroad crossings, regardless of whether crossbucks mark the crossing or not. ...
  • Commercial Motor Vehicles Transporting Passengers. ...
  • Vehicles Carrying Flammable Materials.


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A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This short circuit activates the crossing signal.

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At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so, the slower the train is, the longer the delay and the faster the train is, the earlier the crossing activates.

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In the United States, the Surface Transportation Board categorizes rail carriers into Class I, Class II, and Class III based on carrier's annual revenues.

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Steps for Navigating Crossings Don't stop on the tracks. Make sure you have room to get across. Once you enter the crossing, keep moving. Stop 15 feet away from flashing red lights, lowered gates, a signaling flagman or a stop sign.

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The Skewed Crossing (W10-12) sign may be used at a skewed grade crossing to warn road users that the tracks are not perpendicular to the highway.

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It helps to improve safety by warning drivers of the potential hazards associated with crossing railroad tracks at an angle.

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