The cops on Hollywood blvd ride those things around... on sidewalks crowded with tourists. If they wanted to go fast, they couldn't without risking running over someone. Waste of tax money IMO, they'd be faster on foot... like uncle rico.. Personally, I think they just wanted them to tower over the regular people and intimidate.

Here's a pic (not mine)
http://www.flickr.com/photos/discart...7607344685010/