In the dark hour of the day, the bus moving in the unlit parts of the road along the defined route should use:

In the hours of darkness, a bus has its high or low beam switched on. Either one is allowed, so the options that require only the low beam or only the high beam are wrong.

Driving Exam Questions

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In the dark hour of the day, the bus moving in the unlit parts of the road along the defined route should use: