Show up at a place like Teton Pass, in Wyoming, or the base of Mount Superior in Little Cottonwood Canyon, Utah, and there’s a good chance you’ll run up against packed trailhead lots and skin tracks that look like highways. Backcountry skiing has become a sport for the masses. In some ways, that’s good news: more people are out enjoying the winter wilderness. But in other ways, there are real dangers involved, including avalanches (although some reports have attributed last season’s spike in human-triggered avalanches to expert skiers and riders, not novices).