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Ben Bogart's profile photoAmy Youngs's profile photo
 
"Traffic jams that occur for no reason" What?! Is the reason not always that some car slows down, which propagates backwards? Jams grow faster than they dissipate because cars leaving the jam leave slower than new cars arrive (stopping is faster than starting).

I saw a computer model showing this 10 years ago!

Is a jam possible in traffic made of only bikes? (Does a bike slow down as much when there is an obstacle? Do they bunch up the same way? Do they also leave slower than they arrive?)
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