The paved part.
Seriously, before the thread gets moved to A&S, somebody suggested a few decades back that a car will give you as much room to the left of you as you take to the left of the fog line (when there is one, of course!). I've found that to be generally true. Ride to the right of the white line, motorized traffic will paint the inside of the line. Ride a foot out, they'll pass with a foot to spare. Ride in the middle of the lane, they'll change lanes to pass you.