Out on Denver's eastern edge, past Montbello and into Green Valley Ranch, the city runs out into open plain and the wind gets a long running start. Snow there doesn't so much fall as travel: it scours one stretch of street down to asphalt and lays a four-foot drift across the driveway next door. Sterling Exteriors plows those drives and lots, clears the walks, and comes back when the wind rebuilds what it just carried off. Salt goes down on the approaches, the aprons and the shaded runs that stay hard past noon. The measure of a morning out here is simple — nobody's tires spin on the way out.