There is another variation I have seen ( but the guy was riding it in the park ). Looks like a small tire with flat in front and in back to place each foot on.
google electric unicycle and you get hundreds of variations and designs.
https://www.google.com/search?hl=en&...ZpHAd8Q4dUDCAc
I don't think any of them are road legal. All appear to ride on sidewalks, off road or parks. But that will not stop some from thinking they are "cars". And you know what's coming next ( "Gee, I did not even see that person in front of me when I hit them....." ).
Anyhow, someone thinks they are indestructible or their adrenaline rush needs a daily boost. But I can see using them slowly on the sidewalk or a park trail.
Not for everyone.
At a certain age, 3 or 4 wheels is what we need.
Isaac