Why should a driver be especially cautious of a passenger vehicle's overhang or low ground clearance when crossing a raised railroad crossing?

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1. This concern applies only to vehicles carrying cargo, not passengers
2. All passenger vehicles have identical ground clearance regardless of design, since manufacturers build to the same federal baseline standard
3. Certain vehicle configurations can get stuck or scrape on a crossing with a steep grade or raised tracks
4. Ground clearance has no relationship to safely crossing railroad tracks

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