A driver who is impeding others, and who can avoid that effect without impeding himself or increasing the risk to himself, should avoid that effect.

On the other hand, I had a discussion the other day with another driver who objected to the fact that I left space behind a driver in front of me who was in a queue of traffic doing 20. Mr Pushy, hand on horn, as soon as there were two lanes (I was then in the right hand lane waiting my turn to go past a dustcart in the left) approaching Rochester Bridge Eastwards, pinged past on my inside, went past the rest of the queue, swung right behind the dustcart forcing a white Seat to brake, then went past three more on the inside, and back to the middle lane at the lights at the foot of Star Hill. As I pulled up alongside him for the right turn into Victoria Street he started shouting out of his window, but I reminded him of a discussion I had had when younger with a policeman in Maidstone.

I had been pushing up behind other traffic on the Loose Road, years and years ago, and had been bobbing in and out when other traffic stopped or wanted to turn right etc, and PC Plod flagged me. I told him then that I had just been trying to avoid impeding traffic - and he explained that I had put in a lot of work but passed the traffic lights where the Sutton Road leaves the Loose Road at exactly the same time. Just as Mr Pushy had done in Rochester.

Puzzled, Mr Pushy looked. But the proof was alongside him at the lights.