"The traffic here is shocking: Or at least like a shock wave. Researchers have used the equations that describe the behavior of post-explosion pressure waves to model the flow of congestion when it forms on roads that aren't suffering from a specific, traffic-causing incident, such as construction or an accident. Apparently, these waves act as self-reinforcing attractors, which the authors term "jamitons." No word yet on whether these are the fundamental units of traffic, or if researchers will be waiting to see whether any jamitinos appear at the LHC. "   From http://arstechnica.com/science/news/2009/06/weird-science-ponders-angry-flies-and-guilty-dogs.ars