In the US with similar rules, the right lane is for 2 or more. I have seen highways where buses are are legally permitted to travel the road shoulder.
We have signs too, but this is type is ignored more than any other, perhaps more than all others combined: Drivers doing U-turns on a green light have priority over those turning right on a red light, but not many intersections here have these U-turns, so the ones that do catch many people by surprise. Hence, the warning. My area of the U.S., next to but not in Canada, has both styles in different places. BTW, if Canada is coerced into U.S. statehood, it shouldn't be the 51st. It should be at least numbers 53 through 61, if not more.
In both states where i have been licensed to drive, going back over 50 years, and on the entire Left Coast, passing on the right in a separately marked lane is legal. With this law, left-lane campers don't block the entire width of multi-lane highways. In my licensed states, this has not included passing on the shoulder, or passing within the same lane. Some of the other states above may differ. Re: "When in Rome ..." I.e. while you shouldn't run red lights yourself, you certainly must adapt and make accommodation for those who do.
