Had one pass me on the mountain bike going in the opposite direction on my morning ride about a month ago. Was on a cycle path in pitch darkness and couldn't figure out what it was coming towards me with the low headlight, when he flew passed me it just looked like some guy levitating at speed with a light on his knee, when i looked back all i could see was a taillight and his outline, looked weird in the dark, he was honking.
Not cheap....
https://e-riderz.com.au/
The Veteran Sherman has a top speed of 72kph (45mph)
https://e-riderz.com.au/product/vete...tric-unicycle/
https://oneradwheel.com/know-this-be...ic%20unicycles.