If the road is usually congested, frequent traversers of that road will just get in the habit of staying left until they are near their destination. I do it on

If the road is usually congested, frequent traversers of that road will just get in the habit of staying left until they are near their destination. I do it on PA-22 all the time (albeit not in a condition where people need to pass me on the right), even when the traffic is light, because its what people expect behavior wise on that road.