I always thought that these traffic jams because of nothing are amazing.
Using 22 cars, each with a human driver driving at 30 km/h, researchers were able to see that traffic jams such as this were generally caused by one driver slowing or stopping out of curiosity to better see something else on/near the road. The chain reaction travels from car to car until traffic grinds to a halt.
Video Link: Recreating a shockwave traffic jam
[via doobybrain]
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