[RKDinOKC]

The Continental United States is too spread out for a viable mass transit system.

In theory autonomous vehicles sound great. Practical application, not so much.

The quality of the roads and weather is going to cause problems.
Autonomous vehicles dealing with driver based vehicles and their unpredictability is going to cause problems.
When someone tries to take control of their autonomous vehicle and drive themselves or tries to drive a driver based vehicle after getting in the habit of having and autonomous vehicle forgets what the heck they are doing while driving will also be a problem.