Correct answer
always compulsory.
Outline marker lights are intended to indicate the overall width of certain vehicles such as lorries. They are white at the front of the vehicle and red at the rear. Vehicles wider than 2.10 metres MUST have them fitted, and they are positioned as close as possible to the outermost, highest edge of the vehicle.
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compulsory, but only at the rear.
optional.
always compulsory.
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