We've got bad frost heaves everywhere here. We were once again discussing at work (jokingly) how they need to grade the things...right now there are the occasional signs saying "bump", but bump can mean anything from a minor ripple to a car swallowing, muffler eating pothole.
The worst ones on the back roads sometimes have a homemade sign...when you see those, you know to slow to a crawl or wait until you can go around, and hope the other side of the road is better...which isn't always the case.