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Question
Trailers with low underneath clearance can present challenges when driving over:
Answers
A.  Bridges.
B.  Railroad tracks.
C.  Overpasses.
Explanation
Railroad-highway crossings may be difficult to cross when pulling a trailer with a low underneath clearance. In particular, both low-slung units and single-axle tractors pulling long trailers are especially challenging to drive over raised crossings.

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