There's an irony to driving downtown: since you frequently have to park well away from your destination, there's a real chance that you'll be slower around town than someone taking the bus. Wouldn't it be nice if you could have private, motorized transport for the entire trip? Ford thinks so. It recently obtained a patent for a car wheel that turns into an electric unicycle. You'd only have to detach the wheel and slap on a kit that gives you the controls and seating you need to get moving.