The question is too vague to give a good brief answer. Narrowing it down, I believe that it is possible for a good driver to reduce the stop-go element of heavy traffic by following the car in front at a judicious (more than average) distance and then braking more slowly than the car in front as the traffic in front is reducing speed. When the traffic in front starts to accelerate again the driver then accelerates more slowly until a sufficient distance is achieved between him and the car in front such that the slower braking technique can be used again as necessary. I know from personal experience that it is possible to reduce the stop-start nature of the traffic in this way.