[no_op]

Self-driving vehicles can be symbiotic with mass transit. Autonomous taxis can make rail work better at low to moderate densities by shuttling people to stations. They can also ease the path to higher density development in car-centric suburbs by dropping people off at their destinations and then going to serve other riders or park out of the way, eliminating the need for density-killing parking lots immediately adjacent to businesses. As density rises in these areas, building mass transit will become more viable.

Nor does autonomy have to be limited to car-sized vehicles. It could be used for larger vehicles, perhaps intermediate between car and bus size — once you don't have to pay for a driver, operating a larger number of smaller vehicles is much more viable. These could be dynamically dispatched and routed, eliminating many drawbacks of existing bus service.