Regarding deaths/injuries from riding, you would have to compare:
Scenerio: operator error (riding over a cliff...); thrown/fell off and hit head, etc.; somebody riding a device hit/ran-over someone else; somebody riding a device getting hit by a car/truck/train/tractor; etc. etc.
Device: Classical Segway; Ninebot; Hoverboard; Powered skateboard; etc. etc.
That has very little to do with the subject of this particular discussion.
Personally, I feel that Segway and Ninebot devices are sufficiently similar that having separate forums would not be beneficial.
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