Do more roads really mean less congestion for commuters?

Short answer: yes.

In transportation, this well-established response is known in various contexts as the Downs-Thomson Paradox, The Pigou-Knight-Downs Paradox or the Lewis-Mogridge Position: a new road may provide motorists with some level of respite from congestion in the short term but almost all of the benefit from the road will be lost in the longer term.

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