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Battery life is going to be a very serious limiting factor. It's one thing to walk all day in a new city you are visiting, and think only about recharging yourself. But walking an hour in these, and then carry them (and they should be heavy, relatively speaking) until next charge - I think it would not be worth it.

A lot of these sorts of cities have rental bikes for tourists, by the math you'd probably see 4x the city then with a bike.

> Many people tried to do this with Segways but it never really took off

In my experience, this is the only actual use of Segways. I never see Segways used for anything else but city tours. I think maybe some mall security guards sometimes use them too.