1. You wouldn&#x27;t need a car per person, only enough to comfortably serve peak demand. There&#x27;s never a single point of time at which everyone in a city is on the road. (Except evacuations, but see point 3).<p>2. There is already about one car per person in the US.<p>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.<p>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.