When driving in fog, which headlights should you use?

Using low beams when driving in fog is the best choice because they provide better visibility without causing glare. Fog can scatter light from high beams, making it more difficult to see and potentially creating a blurred effect. Low beams are designed to cast light downward and reduce reflections off the fog, rain, or snow, allowing the driver to see the road and any obstacles more clearly.

Fog lights are specifically designed for use in foggy conditions, but in many jurisdictions they are an additional feature that cannot substitute for low beams. High beams can exacerbate visibility issues in fog by reflecting more light back at the driver, while parking lights do not provide adequate illumination for driving. Therefore, low beams help ensure safety and better visibility in foggy conditions.