Correct answer
Two: the trailer’s own registration and that of the towing vehicle.
Two: the trailer’s own registration plate and another bearing the towing vehicle’s registration. The General Vehicle Regulations, Annex XVIII, section III.4, require its own plate in the longitudinal centre plane and the towing vehicle’s plate on the right. The threshold concerns maximum authorised mass, not the actual weight that day. A single plate from either vehicle does not satisfy this case.
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Only one: that of the towing vehicle.
Only one: that of the trailer.
Two: the trailer’s own registration and that of the towing vehicle.
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