What action is recommended when driving in fog?

When driving in fog, it is recommended to use low-beam headlights. This is because low beams are designed to illuminate the road directly in front of you without reflecting off the fog and causing glare, which can significantly reduce visibility. Using high beams in fog can create a white wall effect, making it harder to see the road ahead as the light bounces back towards the driver. Keeping headlights on low beam helps to penetrate the fog and provides better illumination of road markers and other vehicles, thus enhancing safety when navigating through foggy conditions.

Maintaining the speed limit is not advisable in fog; you should adjust your speed based on visibility. Similarly, driving with windows open may allow fresh air, but it does not directly improve visibility or safety in fog.