If we discount speed cameras and the cameras that police bus lanes and congestion charging then there is realy no enforcement on our roads or walkways. There in lies the problem, no one is going to get caught or fined for this sort of behavour which togeather with the current "I am more important than anyone else attitude" causes such problems.
Maybe in the future all tempoary traffic lights will come with cameras fixed to them. Go past the sign after the light changes and its 60 quid fine and 3 points. It wont solve the issue, much as speed cameras have not but think of the revenues.
Where I live is a left turn at traffic lights. These are set to turn to red to all traffic after a short period of no traffic. This is supposed to give a quicker green light to the first vehicle approaching.
What it actually does is delay traffic, making them stop for no reason.
I suspect most of us are so bloody stressed by our jobs and lifestyle that our heads are fried most of the time, hence simple observable stuff gets missed and we all seem to get worked up over people missing simple observable stuff