One role I see for electric self driving vehicles is a more flexible public transit system. Imagine a fleet of 10 passenger mini buses that you can call on demand which is controlled by a program that can optimize the destinations. Hundreds of people leave an average suburban neighbourhood to commute an hour driving on their own. The infastucture to suuport this is just existing roads. Transit systems or cab companies could provide much more flexible transport and commuters have hours to relax or be productive.