Listening Part 5: Fill in the blanks
PTE Listening Part 5- Sample 8: Fill in the Blanks
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 single track, and asked the drivers to cruise around at a constant speed of 30 kilometers an hour. At first, traffic moved smoothly, but soon, the distance between cars started to vary and vehicles clumped together at one point on the track, but the jams spread 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.