Why Does Traffic Stop For No Reason?

There is nothing more frustrating than when you're stuck in traffic. It's even more frustrating when you find out it was for NO REASON! Why does this happen?

Read More:
China Traffic Jam Could Last Weeks
http://www.wsj.com/articles/SB1000142...
"A 60-mile traffic jam near the Chinese capital could last until mid-September, officials say."

Mathematical model for moving bottlenecks in road traffic
http://www.sciencedaily.com/releases/...
"Vehicular traffic flow has been tackled by mathematicians, engineers and physicists alike."

Mathematicians take aim at 'phantom' traffic jams
http://newsoffice.mit.edu/2009/traffi...
"Countless hours are lost in traffic jams every year. Most frustrating of all are those jams with no apparent cause - no accident, no stalled vehicle, no lanes closed for construction."
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