when should you use the left-hand lane of a motorway

You should use the left-hand lane of a motorway whenever the road ahead is clear and you are not overtaking other vehicles. It is the lane for normal driving, and you should only move to other lanes when overtaking slower traffic or when directed by signs or traffic conditions. After overtaking, you should return to the left-hand lane as soon as it is safe. The right-hand lanes (middle and outer lanes on a three-lane motorway) are primarily for overtaking and should not be used for regular driving, to avoid causing congestion and frustration for other drivers. Certain vehicles, such as those towing trailers or heavy goods vehicles, are often required to stay in the left lane except when overtaking. Keeping to the left lane improves traffic flow and safety on motorways.