Well, I recently moved from small town Louisiana to New York, and I'm nowhere close to crazy enough to try and drive around Manhattan, but back home these are mine:
Seatbelts are mandatory. If there are 4 of us and one isn't buckled, then he has to explain to the others why the car is still in park.
No smoking. If you're going to smoke in my car, you'd better be prepared to triple shampoo the entire interior on your dime and pray that gets the smell out.
Music comes from my ipod. You will take turns looking through the ipod until you find something to listen to, unless you have a song in mind that you know is on my ipod, in which case that song jumps to the top. If you don't like rock (of every conceivable subgenre), classical, techno, or showtunes, and you think gangsta rap is totally worth listening to unironically, then you're pretty much SOL on music. Turning the volume up to rock concert levels is not only acceptable, but encouraged.
I do not get into street races. I don't care if the guy in the tackily embellished Mitsubishi in the next lane is flipping us off while his passenger claims via sign language to have recently fucked your mother , I'm not going to risk my life and yours just to jerk off their pathetic egos. They'll feel like big, tough men when they either A) get pulled over by the cops or B) wrap themselves around a streetlight and, call me a cold-hearted bastard if you will, in both cases I'll pause to laugh like Nelson Muntz before I dial 911.