Culverts clogged with sand along I-70 used to be a big problem for the Colorado Department of Transportation (CDOT). Today, work crews clear them easily with a bright orange HV-56 Series combination truck, made by GapVax Inc.With a 14-cubic-yard debris tank, 1,200-gallon water tank and 5,300 cfm of air flow, the truck helps CDOT deal with tons of sand that gets spread on highways during winter, then washes off and fills culverts before seeping into creeks, ponds and other waters, says Adam Baer, heavy equipment operator based in Aurora, a suburb of Denver.Short work“It’s a workhorse,” Baer says. “We can
