The Traffic Paradox

The main mathematical news

1968: Braess’ paper on using the notion of equilibria to study traffic includes a surprise—closing roads can reduce congestion!

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Additional Theorems / conjectures / Open questions
  • How often does Braess’ paradox occur?
  • How hard is it to determine whether adding a road will increase or decrease traffic?
  • In what other kinds of systems (other than traffic) does Braess’ paradox occur?
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The main mathematical concepts / Principles

91Axx (Game theory)

  • 91A14 (Potential and congestion games)
  • 91A43 (Games involving graphs)
  • 91A80 (Applications of game theory)
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