Japanese researchers recreate a traffic jam in a controlled experiment, showing the shock wave affect of vehicles changing speeds:
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Hmm… another example of academia demonstrating the obvious…
Really? You must exist on a higher plane than me.
When one car stops, how much will the speed of the fifth car back be reduced? And for how long? I’m guessing that the answers depend on a number of factors, so if you could provide the answers in the form of probability distributions, that would be helpful. (You can isolate for certain variables if you like.)
The shockwave jam was also recreated on Mythbusters.
When you drive on the highways, you often come across these “shock waves” – traffic jams or slow downs for no apparent reason (i.e. no accident).
You also come across them when lookie-loos slow down to gawk at an accident on the opposite side of the highway then speed up soon after.