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To prepare for the molasses-like evening commutes that come with the switch to Pacific Standard Time, here's a detailed PDF graphic in the Orange County Register on the anatomy of a traffic jam. It shows you how poor freeway design, roadway debris and excessive lane changing create snarls. For more traffic fun, go to this interactive German traffic simulator and play with the sliders to see how flow disruptions such as on-ramps and lane closures spawn congestion. If you're feeling evil, slide the bars to the right and watch the simulations spin out of control—they'll remind you of home.
On topic: Traffic Documentary.com is by two Los Angeles brothers whose goal is to "write, produce, and direct an entertaining and enlightening documentary about why the heck traffic 'sucks' and what is being done about it."