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...