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Trailers with low underneath clearance may be difficult to drive:
A.  On interstate highways.
B.  Over railroad crossings.
C.  On dirt roads.
D.  At the posted speed limit.
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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