Displacement plows are primarily designed to:

Displacement plows are primarily designed to shear snow from the pavement and cast it aside because they feature a distinct design that allows them to effectively cut through the snow accumulation. This capability is crucial for airport operations, where maintaining clear runways and taxiways is vital for safety and efficiency.

The mechanism of these plows typically involves a blade that angles and moves snow laterally, efficiently moving it off the area being cleared rather than simply pushing it forward. This characteristic is essential for removing substantial snow deposits while allowing for efficient clearing of surface areas without causing damage to the pavement. The design also helps prevent the compacting of snow, which could lead to icy conditions if not addressed promptly.

While other options relate to snow removal and ice management, they do not reflect the primary function of displacement plows, which is focused on physical removal and relocation of snow rather than spreading, melting, or hauling snow away.