If you have a single lane of road, cars only, then it has a variable *passenger* throughput even at a fixed *vehicular* throughput.
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So, why all this emphasis on commercial space and throughput? Futurism!
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Technological development is a process which occurs in active & growing cities--Jacobs writes about this in "Economy of Cities."
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So, cities need to grow--which means they need to be able to handle greater and greater concentrations of commercial activity.
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IF--big if--the only limits to human development are ingenuity, then I think "3 dimensional" commercial space will be more common in future.
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Currently, development of this intensity only exists where the transportation tech allows it to: at a handful of VERY busy stations in Japan
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Shinjuku, Ikebukuro, Yokohama, Shibuya, Tokyo, Osaka, etc...a handful more, tops. But I suspect this is the core of cities of the future.
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There is in fact one example of a city which WAS built according to this principle, now demolished: Kowloon Walled City.
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It solved the transportation problem in a drastic fashion; everyone who worked there also lived there. Remarkable place, RIP.
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Kowloon represents a rough draft, a trial run. The transit hubs of Japan are a second draft, more "first-world" this time.
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For this sort of truly spatial (rather than planar) development, high-capacity transport is needed on X and Y axes; elevators & trains.
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This, then, is my way of saying that cities w/o cars are possible, and cities w/o trains WERE possible...but prob won't be from now on.
End of conversation
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Yes this is true. But I can't drive a train.
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not pertinent for this particular thread but remind me to talk abt vehicle typology soon
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this particular thread is dealing with which modes can supply enough customers for max-intensity commerce to be viable
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the point about driver/owner vs passenger is a good one but for another time
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I know, I was just giving you a hard time. Definitely a massive difference in goals for mass transit vs. private transport.
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thing is I'm sure lots of ppl are thinking same thing; I can't just ignore issue

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I think it depends where you live too, and what you generally do. I know lots of people that have no desire to even own a car.
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certainly--this thread is specifically about transportation requirements for different levels of commercial intensity
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