"Have you not noticed that if you drive at a normal sort of pace, then those plonkers that are trying to race ahead never actually are usually stay in sight for the entire journey? They never actually get very far."
Quite right and there is a very good reason for that. Despite appearances to the contrary (and the odd breakdown) traffic management is quite sophisticated these days. If you have a large, main stretch of city road with lots of traffic lights along it, the best approach is to accelerate very gently and then dawdle along. The timing of the lights along the stretch is designed to encourage this and, when done well, you'll often find the next set of lights turning green as you approach.
The people who design these systems have shown you get a lot more cars through that way than you do if everyone presses down as hard as they can with their right foot all the time. It also saves on fuel and pollutants.