Adjustment of the headlights should be carried out properly so that they do not dazzle other users or that they offer the right angles for best illumination while on the road. The headlights should be inspected for correct alignment at least once every year and whenever a headlight and or front end accessory is added or replaced. The adjustment process involves two screws: So there is one bar on top for the up and down motion and one on the side for the left and right motion. This type of adjustment is simple and necessitates only a blank wall, set twenty-five feet away from the vehicle, and a level floor. It is suggested that vertical marking on the wall should be done as far as possible from the vehicle and also with respect to the bisector of the vehicle width and both headlights and a horizontal marking line of masking tape should also be done. The vehicle should be stationary and should not be loaded; the tank of the vehicle should be half-full. Low beam adjustment should be set at the high intensity zone two inches below the horizontal line and two inches to the right of the vertical headlight line. For the sealed beam models there is a top screw which when turned clockwise will move the beam up and when turned anti clockwise, it will move the beam down.Similarly there is a side screw to move the beam leftward and rightward. For bulb-type headlights the top screw will shifted the assembly towards the right or left, while the bottom screw will tilt the assembly up or down. The high intensity zone should span just below the horizontal line while using the high beam In most scenarios, low beams are more applicable since they are safer for the drivers hence frequently used. One ought to take the car to a dealer's service department as soon as possible for the headlights to be properly aligned.