You seem to be getting down-voted, but autonomous public transportation is a good thought exercise, and yes it already exists on (small) rubber tire fleets. The

You seem to be getting down-voted, but autonomous public transportation is a good thought exercise, and yes it already exists on (small) rubber tire fleets. There are some unresolved problems here, such as where do all the SDCs go when empty? Are they leased? Do we have parking garages with empty cars going in and out of them all day? How do we charge for that? How does this impact green house gas emissions? Even dedicated SDC lanes would have a maximum hourly capacity. SDCs are a good last mile solution, particularly in mid density areas and for the disabled. Conventional trains make more sense to delivering large amounts of people to or from a city center as well general regional transportation.