What is "snow pusher"

Snow pushers (also known as box plows, containment plows, or box style plows) are designed to move snow by pushing it straight ahead. They do this by being constructed with a curved moldboard that lies perpendicular to the direction of travel and a sidewall at either end that keeps the snow contained. For parking lots, runways, laneways, etc. this is an improvement on the traditional windrow plowing, which uses an angled plow to move snow to the side. Snow pushers allow the snow to be moved en masse and completely off site to be piled someplace out of the way.