angle the deflector portion 38 upwardly with respect to surface 52 in use the vehicle 12 moves forwardly in the direction of arrow 34 a 34 fig1 with the blade 14 oriented conventionally at a non perpendicular angle with respect to the direction of forward movement as snow is scraped by scraper plate 32 it moves upwardly along the forward plowing surface 52 in the direction of arrow 34 c 34 from the lower edge 26 to the upper edge 24 and laterally from the inlet end 34 to the discharge end 36 due to the funnel shape of the blade 14 the deflector 30 continues the curvature of the moldboard 22 augmenting the rolling or funneling action imparted to the snow fig1 5 thus the snow is given a momentum in the direction of vehicle movement as it exits from the deflector 30 preferably including a downward component due to the curvature of the deflector 30 fig2 causing the snow to exit generally in the direction indicated by arrow 34 d 34 since the deflector 30 extends well over the surface being plowed the snow does not tend to billow or blow rearwardly obscuring the driver 39 s vision in addition the increased length of the plow 39 s effective working surface augments the funneling effect imparted to the snow causing it to move efficiently from the inlet end 34 to the discharge end 36 when snow begins to build up on the plowing surface 52 of moldboard 22 due to a.