> The US is about 4M square miles. So with 1M cars, you could cover every second grid point and have a car standing by within √2 miles of everyone. This is obvi

> The US is about 4M square miles. So with 1M cars, you could cover every second grid point and have a car standing by within √2 miles of everyone. This is obviously impractical with human-driven taxis, but with self-driving taxis you could get there. The number of self-driving taxis to take every urban dweller to and from work would probably be around 20M, so covering the country would be only 5% extra. This is flatly ridiculous. Yes mathematically sound but you're forgetting the concentrations of people vary extremely widely and so the demand for the cars would also vary extremely widely. And yes, you could then stack more in the urban areas but then we come back to the same problem: what company is going to operate the 5 or so that service my town, and why would anyone in my town use them versus their own already owned cars? And unless we plan to have some that are capable of pulling boats, moving equipment, towing trailers, and what have you you've addressed maybe 60% of traffic. > Similar things to what you said were said about electricity and telephone service in the early 20th centure Except the obstructions to getting phone and electrical service to the rural areas were a lack of funding and some difficult terrain in places, and a need for more switchboards. Show me an EV that can pull a trailer holding four horses (about 4 tons) a few hundred miles and I might believe you, but to my knowledge, that doesn't exist.