Comment by clock_tower

I think there are physical reasons why driverless cars will never be as good as trains: they're rubber-on-asphalt instead of steel-on-steel, and you need a lot more engines, space, and transportation of dead weight per unit of people moved -- and they'll probably still need parking, too. As near as I can tell, driverless cars are horseless-carriage thinking... but trains have no element of novelty to them.