1. You wouldn't need a car per person, only enough to comfortably serve peak demand. There's never a single point of time at which everyone in a city is on the

1. You wouldn't need a car per person, only enough to comfortably serve peak demand. There's never a single point of time at which everyone in a city is on the road. (Except evacuations, but see point 3). 2. There is already about one car per person in the US. 3. Automated car fleets would presumably have a cheaper carpooling option, where the car picks up other passengers on the way to the destination. Like UberPool today. 4. Fixed-line transit costs millions to billions of dollars per mile, and easily takes a decade from planning to completion. Building roads takes a fraction of the time and money. And the roads already exist.