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He can already move at 400 mph on the ground. At those speeds you don't want to do anything that requires maneuvering, like dodging a tree. There is a reason they use the salt flats for things like...
#1: Attribution notice removed
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System
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2021-03-30T23:53:16Z (about 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/34209 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/