Relative Transportation Efficiency
I just made better time from my place on Union Square to the BH on 34th and 9th than any of the people in cars I passed. However, I was bundled into a jacket and expending quite a lot of energy to do it. People in the cars were nice and warm, though.
I was thinking, as the third cab in two minutes to pass within inches of me almost knocked me off my board, that New York would probably be a much easier city to get around in if private cars were banned, a la Central London. Taxis would still be necessary, but if we eliminated private cars and increased the size of the cab fleet by an order of magnitude or two (and maybe implemented tiered service levels?) New York traffic would be manageable.