I love this fact: average walking speed increases predictably as city size increases, roughly as N^{0.1}, where N is city population. http://www.pnas.org/content/pnas/104/17/7301.full.pdf …pic.twitter.com/LyXYH169UX
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So how big would a city need to be before pedestrians are moving faster than light?
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Still, we should be able to use this to determine the largest possible city.
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To double walking speed, you need a roughly factor of 2000 increase in size of your city. So I suspect the size of the Universe is going to be more of a constraint than the speed of light...
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