Headlights often have height control to ensure that oncoming traffic is not blinded. There are three possibilities: - Manual light height adjustment: the driver can adjust the height. - Semi-static light height adjustment: this will depend on the load. Dynamic light height control: the light height continuously adjusts to the movements of the body of the vehicle. Vehicles with gas discharge lamps must have a cleaning system on the headlight according to legislation (this is mandatory). This ensures that you will not blind oncoming traffic and that your road visibility is not poor due to the diffuse light. You can adjust the headlight height using the manual adjustment. When does the driver adjust the headlight height? When the car deflects while driving. When the car deflects at the front. When the car deflects at the rear due to the weight of passengers, luggage or a trailer.