I usually pull to the side and wave them by. There's really no sense in getting into a battle of wills when he's wielding a 6000lb truck and I'm completely defenseless. It's just not worth losing my life or being seriously injured over ego. That being said, this is only a recent change of attitude. Historically I've been much more aggressive and combative...playing games...slowing down...giving chase...flipping the bird...kicking a door...etc. I think I worry more about orphaning my kids these days.