'Not excited' is a massive understatement. Most drivers are completely ignoring the newly reduced (to 65 mph) I-90 speed limit between Bozeman and Belgrade. I travel back and forth often and have been diligent about observing the new speed limit as an experiment - just to see if others were doing the same. I assure you, they are not.
Montana is the Treasure State, so of course rock hounding is a popular pastime. Montana's history is based on the discovery of gold, gems, and other minerals - today there are so many resources and groups for those who love rocks, gems, and geology.