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On a Saturday morning in December 1973, a section of New York's West Side Highway collapsed under the weight of a truck full of asphalt. The road was closed, seemingly for good, and the 80,000 cars that traveled it each day had to find a new way to their destinations. It ought to have produced traffic chaos, but it didn't. The cars simply vanished. It was a moment of revelation: the highway had induced the demand for car travel. It was a classic case of "build it and they will come," but for the first time the opposite had been shown to be true: knock it down and they will go away. Samuel I. Schwartz was inspired by the lesson. He started to reimagine cities, most of all his beloved New York, freed from their obligation to cars. Eventually, he found, he was not alone.