I agree that 10 years is much too optimistic for most places, but I think it's possible. I wasn't looking towards public transportation directly, actually, in m

I agree that 10 years is much too optimistic for most places, but I think it's possible. I wasn't looking towards public transportation directly, actually, in my assumption of how this is going to be solved. Rather, I think a much bigger event will be large networks of self-driving cars. Maybe Sao Paulo will "never" see them, but plenty of cities will, and those cars will do wonders in solving congestion issues. Combine self-driving cars with increased and improved public transport, and I'd bet a few large cities have it all solved on the 10-ish year timeframe. As far as the California High Speed Rail project...well, that's not how to solve the problem. At least not in my opinion.