The issue is that these self-driving cars are limited to a few big cities--where they're least necessary, since good public transit is far more efficient, many

The issue is that these self-driving cars are limited to a few big cities--where they're least necessary, since good public transit is far more efficient, many things are within walking distance, and speed limits are low anyway. IMHO the biggest potential for self-driving cars is in suburbs and exurbs where mass transit is inherently less efficient.