I saw this.
What happens about pedestrians? If you are crossing the road and all the cars suddenly get the "green wave" you're a bit stuffed surely?
I guess it ties in with this other thing Boris wants to do where he is reducing the time pedestrians have to cross many roads, and pedestrains will get a countdown to tell them how long they have to get our of the road. According to the Times this rather scariliy means that "People used to having a certain time to cross at their local lights may suddenly find themselves halfway across the road as the traffic starts to move."
Fabbo.