What lights must a driver use in dense fog?

In dense fog conditions, using dipped headlights and rear fog lights is essential for safety and visibility. Dipped headlights provide enough illumination to see the road directly ahead without causing glare for other drivers, which can occur with high beam headlights. High beams can reflect off the fog, leading to reduced visibility instead of improving it.

Additionally, rear fog lights enhance the visibility of your vehicle from behind, allowing drivers in trailing vehicles to see you more clearly, which is crucial in low-visibility situations such as fog. This combination of lights ensures that you can see well enough to navigate safely while also being seen by others on the road, contributing to overall road safety during foggy conditions.