Abstract: A frontal assembly for mounting on the front of a vehicle that serves to reduce drag, increase wheel traction and shield the windshield. A deflecting plate with a convex frontal surface extends up and back along a smooth, continuous curve of a selected radius as viewed from the side so as to cause the air to flow upwardly and rearwardly in a rolling action and then back over the roof of the vehicle. The deflecting plate extends laterally of the hood a sufficient length to direct airflow away from the front and along the sides of the vehicle. A fastening arrangement releasably fastens the deflecting plate to the vehicle. A support for the plate resists the forces of the air flowing against the deflecting plate during movement to hold the plate in position during use and is adjustable to enable changing the angular disposition of the upper edge portion of the plate so that the upper edge portion is always directed substantially toward the roof of the vehicle during use.