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On motorways you should never overtake on the left unless

A there is a queue of slow-moving traffic to your right that is moving more slowly than you are
Only overtake on the left if traffic is moving slowly in queues and the traffic on your right is moving more slowly than the traffic in your lane.
B you can see well ahead that the hard shoulder is clear
C the traffic in the right-hand lane is signalling right
D you warn drivers behind by signalling left