I live in a Chicago neighborhood where these are in use. They have very bright lights, actually blinding you as you approach one at night. They move much faster than is appropriate on a sidewalk. They position themselves in the middle of the sidewalk as opposed to the right hand side, impacting traffic in both directions. They round corners at intersections at below-eye-level, I’ve walked into more than one when they…
"Normal" people can walk around at least. How about wheelchair-bound, blind, old/frail for whom walking up down iced/snowy sidewalk edge onto a pavement with moving cars may be an issue, etc. ?