______________________ must always stop before crossing railroad tracks.
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Tank trucks marked with hazardous materials placards
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Sport utility vehicles carrying four or more persons
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Any vehicle with 2 or more axles or weighing more than 3,000 pounds
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Motorhomes
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Explanation
Some vehicles, such as those carrying hazardous materials, must always stop before crossing railroad tracks. These vehicles pose significant risks in the event of a collision, so regulations require them to stop at crossings to ensure safety before proceeding.
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