Which of these vehicles must stop before crossing railroad tracks?

Motorhomes or pickup trucks towing a trailer.
Passenger cars with automatic transmissions.
Sport utility vehicles carrying four or more persons.
Tank trucks marked with hazardous materials placards.
Explanation

Vehicles that must stop before they cross train tracks include buses, school buses, and trucks transporting hazardous loads. Tank trucks marked with hazardous materials placards must stop before crossing railroad tracks because they are carrying potentially dangerous substances. Stopping allows the driver to check for trains and ensure the crossing is clear.

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