Yep, something like this would be a serious hazard to pedestrians. I'd want to see a serious anti-collision, anti-hazard system (e.g. can't plow into a pedestrian or a show window or fall off a curb) integrated into any machine this massive before letting it into any area where it will mix freely with pedestrians and bicyclists. There's a reason why motor vehicles aren't allowed on sidewalks and their drivers are licensed.
about 20 pounds, right.