Right, but with a self-driving taxi system you don&#x27;t need a discrete car per person that&#x27;s only used for transit in and out of the city. You can use fewer and reuse them over and over and over again during the course of a day. This is both a more flexible and more robust system than trains. Plus, given a grid system like Manhattan, blockages can be routed around.<p>People don&#x27;t seem to believe me, but we&#x27;re all on the internet aren&#x27;t we?