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For the first time, Japanese researchers have conducted a real-life experiment that shows how some traffic jams appear for no apparent reason. They placed the 22 vehicles on a track, and asked the drivers to cruise around at a speed of 30 kilometers an hour. At first, traffic moves smoothly, but soon, the distance between cars started to , and vehicles clumped together at one point on the track, but the jams backward around the track, like a shockwave at a rate of about 20 kilometers an hour. Real- life jams move backward at about the same speed.
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