They give people tickets for passing on the right, and for driving in the left (passing) lanes. We should do that here and we could make our roads much safer. It is much more organized to drive in Europe where everyone is keeping right except to pass.
Reminds me of the stupid signs some states put on their freeways: "SLOWER TRAFFIC KEEP RIGHT." Obviously, some left-lane squatters read that to mean it applies only to traffic SLOWER THAN ME.
"KEEP RIGHT EXCEPT TO PASS" seems a whole lot smarter, and less open to interpretation.