Scientists are hard at work on this one, studying computer models of the physics of gridlock and inventing all new traffic-light algorithms. Some of them postulate that the rhythms of automobile traffic are influenced by the same cyclical forces that cause waves in the ocean. For the average commuter, though, it may be helpful to think of it this way: congestion. There are just too many darn people trying to do the same thing at once. (Flush every toilet in a single office building simultaneously, and see what happens.) All of this by way of saying: Buy a newspaper, load up some favorite tunes on your MP3 player, and take the bus.