"@ps61318: I think Asimov did it in 1954 before Niven, but it's been done by others too.
[en.wikipedia.org]
The concept of a megalopolis based on high-speed walkways is common in science fiction."
"In the picture above, both tracks move in the same direction, suggesting that there is an express track for through-traffic, and a local track for people about to stop.
Still not as good as Asimov's series of moving belts that get faster as you step over to the next ones."
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