Abstract: An air-flow management device mountable on an upper, forward portion of a vehicle having either a cab and a van or a tractor/cab semitrailer is disclosed, having a base, a first vertically upright airfoil secured to the base on the right extending from slightly above the cab to substantially the height of the van or semitrailer, a second vertically upright airfoil secured to the base on the left extending from slightly above the cab to substantially the height of the van or semitrailer, a first surface positioned behind the first airfoil to deflect the air-flow toward an exit opening at the right of the vehicle and a second surface positioned behind the second airfoil to deflect the air-flow toward an exit opening at the left of the vehicle.