Players could buy a garage attachment to their condo and then purchase cars to own and drive. Actually driving would be tricky, but they could operate like a taxi. You'd take your car out and then could get a GPS-like interface similar to the taxi and "drive" it wherever you wanted without the taxi fees. You could also give free rides to other people as well (maybe an interface showing open seats getting filled by the avatar live, and then when you travel it sends all of you together).