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Question:

On some roads, lanes reserved as "Only Bus" are intended for

A buses only (with a few exceptions).
Explaination

On some roads, signs or pavement markings indicate that certain lanes are reserved for special vehicles at certain times. In the District of Columbia, "Only Bus" pavement markings mean that the lane is intended for bus use at certain times, but taxicabs, bicycles, paratransit service vehicles, and emergency vehicles may also travel along the bus lane. Signs along the bus lane state when the bus lane is in operation.