Use caution at all times. The moisture in the air may continuously collect on the windshield, making it more difficult to see. Adjust the defroster and windshield wiper speed as necessary. Use fog lights or driving lights (if equipped). Many vehicles have fog or driving lights that were installed at the factory. These lights are usually mounted low, in or below the front bumper. They are aimed toward the ground out in front of the vehicle as far as possible. Fog lights mainly differ from driving lights in the way they project the light. Fog lights often have clear or yellow lenses; while driving lights usually have clear lenses.