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Here : https://en.m.wikipedia.org/wiki/Braess%27s_paradox https://en.m.wikipedia.org/wiki/Braess%27s_paradox This is the principle behind it I believe. It's a

• toast0 3y ago
  I don't think that's the issue here if the poster is correct that the better route is more expensive than the one that failed. It's not irrational or paradoxical to use a route that's less expensive regardless of quality, but fail over to a more expensive route that also happens to be better quality. If you were planning to send something in the mail because it's low cost, but the post office was closed, you might use a courier service instead, pay more, and get your item to the destination quicker. No paradox there.