Here's a solution: Buy a Smart Car
http://www.smartusa.com/ We saw more of these while in and around TV for the past two weeks than we've seen since they first started selling them in the U.S. Park them on the squares like a golf cart, cross/drive on any street you'd like, drive them on the freeway....just don't use the cart or multi-modal paths!!!
I think they're pretty cool. Not much room inside for shopping trips anywhere of consequence, though.........and have fun if you're on the short end (pun intended) of a traffic accident! Though they are highly rated for safety "in their class", I'd contend that hooking up with, oh say.....a Chevy Suburban in a highway confrontation would have the Smart Car coming out the loser. But it would definitely solve the "Where am I allowed to be?" dilemma.
Bill