I'll fourth or fifth the motion -- get off the right edge of the road. Look at the lane, and see where the car's tires track; AT LEAST, get into the right-tire track, and STAY THERE. Let 'em blow the horn (at least they see you!), you have the same right to the road as they do -- LAW, in all 50. You do NOT need motorists' permission to be there.

YEAH, THAT CAR WAS PRETTY F'N CLOSE. Good reason to have an Airzound.

(And, while we're at it, since you have internet access, look up the law in your city & state.)