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Traffic Jams
For the first time Japanese researchers have a real-life experiment that shows how some traffic jams appear for no apparent reason. They placed 22 vehicles on a single track and asked the drivers to around at a constant speed of 30 kilometers an hour. At first, traffic moved but soon the distance between cars started to vary and vehicles clumped together at one point on the track. But the jams backwards around the track like a shock wave at a rate of about 20 kilometers an hour. Real-life jams move backwards at about the same speed.
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