On a 4-lane road (2-lanes same direction), the left lane is for passing, the right lane is for driving. If you're not passing, get back in the right lane.
If people are passing you on the right, you're in the wrong lane. Speed limit doesn't matter. If they're speeding, it doesn't matter, that's for the cops to deal with. Move over.
I agree it happens to me all the time on the mountain and is really irritating.
Ranting is better done with those you know. Tell a friend about MyPetPeeves.com