Just as a sample, I used to have a 3.5 mile commute in NYC. It's about 45 minutes by walking, 25 minutes by bike (google maps says 15 minutes, I never did it t

Just as a sample, I used to have a 3.5 mile commute in NYC. It's about 45 minutes by walking, 25 minutes by bike (google maps says 15 minutes, I never did it that fast), 12 minutes by subway, or 19 minutes by driving. That's with current speed limits. New York City is so clogged with traffic that walking is actually competitive with driving, and biking would be faster than driving currently if the traffic lights weren't timed for an imaginary 25-35mph speed limit (that is never achieved). Out in the suburbs, the distances are long and speed does matter. That makes the situation very tough; 15mph speed limits are going to severely devalue your real estate investment. I really have no answer for a sane transition here, and that's a big problem American society faces. (On the other hand, the ocean consuming New York City is going to severely devalue real estate investments, too.)