It's never been tested, to my knowledge. To be clear, I'm not suggesting people tailgate and drive aggressively in the left lane. I'm literally suggesting cars

It's never been tested, to my knowledge. To be clear, I'm not suggesting people tailgate and drive aggressively in the left lane. I'm literally suggesting cars in the left lane have to legally yield to overtaking traffic from behind, just as passing on a two lane highway requires yielding to oncoming traffic. And I would expect behavior improvement, if nothing else, on the fact that ambiguity is removed and time of conflict is reduced. >king of the road, get out of my way" behavior. I get that's not something people might want to "encourage" , but a certain amount of conflict and congestion is resolved by allowing the people who think they're king, be king in the left lane. If you don't want to go faster than the car behind you, you can be king in the right (or any other) lane. It might not feel right based on principle, but in a practical sense it solves a lot.