Overtaking on motorways
Here is another Highway code rule shared by the DVSA. In this one its about the rules on Overtaking on motorways.
The Highway Code applies to England, Scotland and Wales and is essential reading for everyone.
Do not overtake on the left or move to a lane on your left to overtake. In congested conditions, where adjacent lanes of traffic are moving at similar speeds, traffic in left-hand lanes may sometimes be moving faster than traffic to the right. In these conditions you may keep up with the traffic in your lane even if this means passing traffic in the lane to your right. Do not weave in and out of lanes to overtake.