Obedience to the green man is all-pervasive. No one crosses the road before he appears, even when the streets look like this.
(This seems to be just part of a more general compliance - markings on the pavement indicate lines for queuing for trains and tubes, and the crime rate is very low: you don't have to worry about your bag or wallet being nicked. In fact, if you happened to lose either item, you'd probably find it at the nearest lost property area within five minutes. Is all this conformity part of an ongoing military ethos, perhaps?)