A simple and effective way of dissolving a traffic jam is to keep going at the same speed - let me explain:

You see congestion up ahead, and you slow down to, say, 40mph. This creates some room in front of you in anticipation of the inevitable braking. You then drive through the traffic jam at a constant speed with no acceleration or deceleration, and the people behind you will have no choice but to follow (or change lanes which is the weak point of the solution) What you will see at the other end (if you could go back and look) is that you have dissolved the jam because you have prevented people from decellerating quickly and accelerating slowly.

Several people have tried this successfully and it works.