This is a really interesting find and in theory would work so well if everyone actually did it during a traffic jam.
The summary of this article is (if you are too lazy to read, but you should because its good!) that when I see a traffic jam in front of me I slow down and leave a big space in front of me so that the traffic jam in front of me can dissipate before I get there. By the time I arrive at the location of the traffic jam it will be gone and the cars behind me can keep a steady pace without having to feel the effects of a traffic jam. If I did exactly the opposite when approaching a traffic jam (speeding up and stopping when I get into the traffic jam) I will do nothing but feed the wave and it will keep on perpetuating the jam.
Here's the link
Click hereTry this the next time you see a jam (that is if no one cuts in front of you) and see if it works.
Alex.