“Friends don’t let friends drive I-70.” The tongue-in-cheek mantra is often uttered by Colorado skiers and snowboarders who frequent resorts far from the crowded mountain corridor, which funnels thousands of vehicles onto two lanes west of Denver every winter weekend. “It’s nightmarish. Hours and hours in the car. I think the last time I went to Keystone (typically a 90-minute drive from Denver), I spent four hours getting there and five hours getting home,” said Cole Capsalis of Denver. “There was more time in the car than skiing.”