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Hm, I think it SHOULD be about injury risk, which is a combination of speed and damage upon impact. The latter is a combination of speed and mass. And it looks heavy.
The deciding factor on whether something needs a license is usually speed. If this goes slow enough, it would be fine without a license, IMO
Top speed on this thing is 25kph (at least in the UK).
Hm, I think it SHOULD be about injury risk, which is a combination of speed and damage upon impact. The latter is a combination of speed and mass. And it looks heavy.