I think I smell one of those guys who camp out in the passing lane self-righteously driving exactly the speed limit, forming a rolling roadblock for everyone behind them. Used to be a lot of that during the 55 mph days. Less now, but still a few left.
Texas passed a "road-rage" law a few years ago that includes a $200 fine for camping out in the passing lane. Regardless of your speed, if you are passed on the right, you have committed the violation. The reason for this: in some cases the one driving the speed limit was the one responsible for causing the collision.