I live in Denver. I70 goes from ~5300ft in Denver to over 11,500 at the tunnel. It takes about 60 miles to do so. In a storm, they constantly plow if they can keep up with the snow. They close the highway if they can't. Very few people around here use chains. The smart drivers use snow tires. The Texans end up upside in their truck wondering what just happened...

Colorado definitely has traction laws. Passenger vehicles needs AWD and appropriate tires. Trucks need chains. There is likely no way a semi could get over that pass without them in a storm.