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 th

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).