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Question
Low underneath clearance can cause difficulties when driving:
Answers
A.  Over railroad crossings.
B.  On gravel roads.
C.  Around corners.
D.  At the posted speed limit.
Explanation
Railroad-highway crossings may be difficult to cross if you are pulling a trailer with 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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