In the Province of Ontario, Canada, on all divided multiple-lane roads there is no “passing lane” as such. Any lane is a passing lane and this has been the law there for years. This obviates the danger incurred from those motorists who insist upon “sitting” in the passing lane.
It works in Ontario without any fuss or bother and minus accidents as well. To operate efficiently this system only requires motorists with some sense of lane discipline and an appreciation of their responsibilities.