Seems pretty limiting to me. Street legal in a VERY constrained set of circumstances. Only roads with bicycle lanes or a speed limit of 25mph or less. And probably varies wildly based on jurisdiction.
https://www.dmv.ca.gov/portal/dmv/?1dmy&urile=wcm:path:/dmv_...
Edit: Downvoting? That’s cool, but please explain where I’m off base. Do you not think that “has bike lanes or a speed limit of 25mph” is pretty limited?