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Question:

Low-slung vehicles can be risky at railroad crossings because

A they are more likely to get stuck on raised railroad crossings.
Explaination

The two types of combination vehicles most likely to get stuck at a raised railroad crossing are low-slung units (car carriers, lowboys, moving vans, etc.) and single-axle tractors that are pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor. Be very careful when driving such vehicles at railroad crossings.