Which vehicle must always stop before crossing railroad tracks?

• A. Tank trucks marked with hazardous materials placards.
• B. Passenger cars.
• C. Buses.
• D. Motorcycles.

Answer: (A)

Hazardous materials have special safety rules at railroad crossings because the cargo can be extremely dangerous if spilled or ignited. A tank truck carrying hazmat placards must come to a full stop before the tracks, even if there aren’t any signals showing, to give the driver a moment to check for an approaching train and ensure the crossing is clear. After stopping, the driver may proceed only when it’s safe to cross. The other vehicles—passenger cars, buses, and motorcycles—do not have a universal stop requirement at every crossing; they must follow the crossing’s signals and signs and stop only when those indicate. This hazmat rule reduces the risk of a collision involving dangerous cargo and helps protect people and the environment in the event a train is near.