The headlights need to be aligned in the correct manner to avoid blinding other road users; an act, which, may cause accidents of high severity, or hinder vision. The aim should be checked at least yearly or when either a new headlight is fitted or when there is some front-end body work. Some vehicles have adjustment screws at the top of the halogen bulb style headlights; for sealed beam headlights there are in board and upper adjustment screws only externally visible. One of the most basic ways of making the adjustment is with the help of masking-tape, 'blank' wall and 'level ' floor. Taping work should begin at the desired position on the wall and was fixed to draw a vertical line corresponding to a center line of the vehicle when used with the center line of both headlights, as well as a horizontal tape line. The vehicle must be parked 25 feet from the wall, not tilted, containing half a tank capacity of gasoline and should not be carrying any overloading. For low beam adjustment position the high-intensity zone 2 inches under a horizontal line drawn through the centre of the headlamp and 2 inches to the side of a vertical line drawn through the centre of the motor vehicle away from traffic moving in the opposite direction, and then tighten the screws. With the high beam on the high intensity zone should ideally be just below the horizontal line at night. If you have to negotiate, retain low beams on the grounds of safety and then seek to get the headlights calibrated by a professional as soon as possible.