Yes, the auto-pilot is easy on rails (Morgantown built one in 1975), but rails are expensive, many to many rail networks are even more expensive, and grade sepa

Yes, the auto-pilot is easy on rails (Morgantown built one in 1975), but rails are expensive, many to many rail networks are even more expensive, and grade separated rail networks are insanely expensive. The Morgantown system final price was 12 million 1975 dollars per mile. So by using advanced self-driving concepts (but not yet full self-driving alongside human drivers), you can repurpose much of the existing road space for personal public transit, without creating completely new infrastructure.