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I agree that a narrower tunnel costs less (displaced rock is quadratic with tunnel diameter), but is it cheap enough to offset capital costs for all but a few e

• deleted 11y ago
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• paulsutter 11y ago
  Look at the rate of subway construction in China[1]. Self driving cars + tunnel means the subway comes to you, the riders don't need to go to the station. In the US tunnels seem like a rare and expensive thing, but they're very commonplace. [1] http://www.businessinsider.com/why-china-is-tunneling-a-mind-boggling-800-miles-in-2-years-2013-3 http://www.businessinsider.com/why-china-is-tunneling-a-mind... The difficulty of public works projects in the US is a legitimate question. But it's a separate question from what self driving cars will make possible (especially for the 90%+ of people who live outside the US).