Although legally correct, that's a shade facile. Theses incidents do not occur
at normal driving speeds on open roads, because the scumhounds do not
want to get hurt. They occur at very slow speeds at roundabouts and T-junctions
where, because all the vehicles are moving slowly, drivers get much closer to
other vehicles than is usual. They hit the other vehicle, not because they
have not left enough stopping distance, but because they are taken
completely by surprise and don't react instantly.

If all motorists left enough distance between vehicles to make this scam at
roundabouts impossible, London's traffic would sieze up.