Key to making cities "walkable" is to improve last-mile mobility: e.g. make elevator cars move in more dimensions:http://theverge.com/e/7082626
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@Nightwolf42 There's still a Metcalfe's Law for face-to-face interactions. Also why endless pontification hasn't gotten people out of cars.
@Nightwolf42 If pop. interacts w/= probability, value of road network + metropolis rises as 4th power of end-to-end distance/time.