Highway snow removal clearing job after snowfall travel easier safer both snowy icy roads snowplow plow snowplough or snow plough device mounting vehicle removing ice outdoor surfaces surface winter vehicles areas pickup trucks truck clear surface road treated spreading chemical salt distribution freezing melt lower temperature treatment applied preventive sand brash slag improve traction melted graders grader equipment remove compacted streets street de icing deicing chemicals care asphalt grit clog pavement cracks van malatya salts toxic tires tire particulate matter air pollution. snowplows snows fall freeze frostbite iciness slippery closed traffic cold cool chilly hoarfrost chill frosty cleanliness cleanup storm blizzard air