keep to the left-hand lane unless overtaking
You should normally travel in the left-hand lane unless you are overtaking a slower- moving vehicle. When you are past that vehicle move back into the left-hand lane as soon as it’s safe to do so. Don’t cut across in front of the vehicle that you’re overtaking.
B use the lane that has least traffic
C overtake on the side that is clearest
D try to keep above 50 mph to prevent congestion