I actually see autonomous cars complementing trains very well because they can be used for the last mile problem (getting people from the train station to the d

I actually see autonomous cars complementing trains very well because they can be used for the last mile problem (getting people from the train station to the destination they actually want to arrive at). They are also available for areas poorly served by transit/inconvenient connections. But I don't see them making more impact on somebody who's already driving. Traffic will still be traffic and walkable cities will have to limit that. It's the same car after all, just driven by a computer. All those current issues for heavy car-dependence won't be solved by autonomous driving.