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Braess's Paradox

How a New Road Makes Traffic Worse

Add a fast shortcut to a road network and everyone's commute can get longer, because each driver picks the route that is best for them. That's Braess's paradox, and it's math, not a joke.

Sources (3)
  1. Braess, Nagurney & Wakolbinger, "On a Paradox of Traffic Planning" (opens in a new tab)
  2. Easley & Kleinberg, "Networks, Crowds, and Markets", ch. 8 (opens in a new tab)
  3. Scientific American, "Detours by Design" (opens in a new tab)

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