how large a city could you build (how many people) in which 1) the only forms of transportation are walking (or chairs/electric…

how large a city could you build (how many people) in which 1) the only forms of transportation are walking (or chairs/electric scooters for the disabled) and elevators; and 2) max travel time within 30 mins? walking need not be at surface level (eg pedestrian bridges btw towers)

— Steve Randy Waldman (@interfluidity) February 15, 2019

(via http://twitter.com/interfluidity/status/1096490577472905216)