Final answer:
To reduce risk in fog, clean all vehicle lights and use low beam headlights to maximize visibility and reduce glare.
Step-by-step explanation:
To reduce risk in fog, you should both clean all lights on your vehicle and use low beam headlights. Cleaning the lights ensures that they provide the maximum visibility possible by removing dirt and grime that can diffuse or block the light. Using low beam headlights is crucial because high beams can reflect off the fog, creating a glare that makes it more difficult to see. It's similar to avoiding flash glare when taking photos in a dimly-lit situation. You would shoot at an angle to avoid the harsh reflection that can obscure details in the picture.