What lanes can trailers being towed use on the motorway?

Answer: B — Lanes 1 and 2; not right-hand lane unless lane closures

Trailers being towed are considered heavy and slow-moving vehicles on the motorway. It is important for them to stay in the slower lanes to allow faster vehicles to overtake safely. Option A is incorrect because it is not safe for trailers to use any lane. Option C is incorrect because it is not safe for trailers to use only the left lane, as this may cause traffic congestion. Option D is incorrect because trailers should not use the faster lanes, as this may impede the flow of traffic.