This is a new one as of April, 2010. The speed limit just changed from 75 to 65, but no one is aware of this. The cops sit between the eastbound-westbound lanes near the truck weigh station between the uptown Butte & Rocker exits. They like to prey upon westbound drivers, because the center of the road cannot be seen when you come up the hill out of Butte. Watch this whole stretch through Butte, however, because of the recent speed limit change.