Heavy motor vehicle traffic along one of the most scenic mountain corridors in the U.S. results in enough congestion to create traffic jams that make what could be a one-hour drive take most of the day. The snowy, icy conditions often result in vehicles spinning and sliding on the stretch of the Interstate 70 highway. Steven Polzin, research professor at ASU’s School of Sustainable Engineering and the Built Environment, part of the Fulton Schools, explains why coming up with a solution to the problem can be complicated. For instance, widening the road would speed up traffic but also raise concerns about negative impacts on the environment, Polzin says.