This is just fundamentally wrong -- Sterling Anderson doesn't know what he's talking about and is exposing his own ignorance. He's missing two major characteristics of auto traffic:
(1) Rural areas. The value of your own car is that it is ready to go immediately. A shared autonomous car has to come to you first, and in a rural area, that's a *long* delay.
(2) Rush hour. The number of cars is sized for *peak* demand, not average demand. There will always be cars sitting around doing nothing at midnight, being used during rush hour.
Now, if you happen to live in a big city where there is likely to be a car nearby at any moment, (1) doesn't apply as much... unless you're in rush hour and all the autonomous cars have been taken already. And if you happen to live in a city which is very active 24/7 and has widely staggered shift starts and stops, then (2) applies less than it does to, for example, the Gigafactory with the entire shift arriving and leaving at the same time.
But these two factors are huge, and dominant. How many cars are really sitting idle *during rush hour*? That is the MAXIMUM number of cars that autonomous vehicles can permanently remove from the roads. Then subtract from that all the cars which are at isolated ranch houses or farms where it would take ten minutes to get to the next house. That even lower number is the MAXIMUM number of cars you'll see displaced. You'll actually see fewer than that displaced because many people will choose to have their own car for other reasons (not wanting smokers to use the car, etc.)
My point is that autonomous cars aren't really going to reduce the number of cars much. If you have data which shows that there are a lot of cars, in dense urban/suburban areas, sitting idle *during rush hour*, I would love to know how many there are. Maybe it's more than I thought.
The effect of autonomous cars on *cost* is another matter. I've often thought that big cities ought to have a lot higher usage of taxis (or the taxi-like Uber and Lyft and so forth) than they actually do, and the reason is probably the cost. Autonomous cars, once you've got enough corner cases working, are strictly superior to taxis in every way while simultaneously being much cheaper to operate. They won't just replace the taxi market, they'll substantially enlarge it.
But there are no taxis or Ubers in rural areas and it isn't for lack of drivers, it's for lack of practicality.
Ugh. Especially because you so confidently state that Anderson doesn't know what he's talking about I gotta get back at ya on this. autonomous cars aren't really going to reduce the number of cars much is a bold claim but your supporting arguments are weak.
1. Urban population in US is 83%. Rural doesn't need to be in the picture at all for a substantial impact.
2. Current personal vehicle utilization is ~5% so replacing 5 cars means the 1 replacement fleet car will be sitting idle 75% of the time. That's quite generous.
3. Anderson says it CAN displace, he doesn't make any claims about how many WILL. It's not about the rush hour, it's about how many people will find cost/benefit of not owning a vehicle preferable, and how many will like the vehicle to pay for itself when they don't need it. We know millennials don't fancy car ownership so the norm of car ownership might change to using fleet cars faster than you think. Sure some people will cling to vehicle ownership but overall the rational thing to do is to share so unless you can prove that people will be especially irrational in this area, it'll happen.
4. Rush hour isn't an hour, it's many hours and usually reverse traffic is light. One fleet car can do multiple trips on the same day in the same direction, going back empty if needed.
5. Real-time carpool arrangements with fleet vehicles is be a killer app. Sure you have to deal with the vehicle picking up other people but you get where you're going much faster due to carpool lane utilization.
I can keep typing but I think that's enough already.