Can we banish the phantom traffic jam?

A traffic jam, by definition, is caused by all of us. The root cause may be an accident, or construction, or the crush of mid-sized SUVs leaving a Billy Joel concert, but if you're part of the traffic flow, you're part of the problem. But for some kinds of traffic jams -- those that appear for no obvious reason -- there's a not-obvious solution. A single driver, armed with a rudimentary knowledge of fluid dynamics, can dissipate or prevent a miles-long jam. With the same methods, drivers working cooperatively (and aided by some here-and-now technology) could significantly and continuously reduce traffic backups on highways.