You sort of have a point with the infrastructure argument, but I&#x27;m still getting a bit tired of seeing it. The roads didn&#x27;t just spring into being. A great deal of money is spent on new roads and widening existing roads every year. If half that money went to rails, we would very quickly have an extensive and efficient rail system. As for space, one set of rails takes up about the same space as one lane of traffic. There are plenty of places where a lane could be taken off each direction of a freeway, replaced with trains, and the total throughout would be increased drastically.<p>Self driving taxis could be used for the last mile in those cases where transit really is too far from home or work.