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Which of these vehicles must always stop before crossing railroad tracks?
A.  Tank trucks with hazardous materials placards.
B.  Motor homes or pickup trucks towing a boat trailer.
C.  Sport utility vehicles carrying four or more persons.
A diamond-shaped sign on a truck means that the load on the truck is potentially dangerous (containing gas, explosives, etc.). Vehicles displaying these signs are required to stop before crossing railroad tracks.
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