Ever find yourself stuck behind lines of traffic on the interstate, but when you get to the end of the slowdown there's nothing there? Now you can find out how traffic phenomena like this occur at Traffic Waves, an interesting site created and maintained by William J. Beaty, an electrical engineer in Seattle. As the site reveals, Beaty is not an expert in "traffic physics" but rather a commuter who has had plenty of time to observe traffic patterns and try different experiments. In addition to several essays on traffic patterns and experiments, the site features illustrations, animations, related links, and a FAQ. A fun site for anyone who spends too much time behind the wheel.