Traffic jams 

Most traffic jams are unnecessary. Local transport engineers manage to achieve local improvements, but after a while the flows rearrange, and the same traffic jams appear elsewhere.

Mathematicians who specialize in traffic flow would like to solve urban traffic jams forever.

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Mathematicians have solved traffic jams, and they're begging cities to listen

Mathematicians have solved traffic jams, and they're begging cities to listen

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