I was driving through Durban's CBD yesterday and was stopped at every traffic light along a straight section of road.
I wonder how much time and petrol will be saved by synchronizing those lights. Strictly speaking, if you get stopped at one light and all the others are synched, when you go you should get through them all. Not only will that be really pleasant, you wouldn't have to brake, then accelerate again in first gear and go through the gears again, your engine could run at constant, lower revs in a higher gear saving you fuel as you go.
This wouldn’t work for those that tear from light to light at high speed because by the time they arrived at the next light, the traffic that had built up there would not have moved off yet and they would be braking, then accelerating again, wasting more fuel than ever...