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)
Walking at about 6 km / hour means a diameter of about 3km, for an area of about 7 km^2. With Manhattan density (about 25,000 people per km^2) that means about 200,000 people.
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If you 2x the speeds (say, with a combination of horizontal elevators and scooters), you 4x the population, so getting up toward a million people. I suspect it'd be rather more pleasant (and feel less dense) than Manhattan, due to the reduction in roads.
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Note also that Dhaka's population density is nearly double Manhattan's. And places like Dharavi are more than 10x Manhattan's. But I doubt it's the model you want.
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Great question, and fun thought experiment.
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