What is the best action to take when driving in fog?

Driving in fog presents unique challenges that can significantly affect visibility. The best action to take is to use low beam headlights. This choice is effective because low beams create less glare in foggy conditions compared to high beams. High beam headlights can reflect off the moisture in the fog and create a blinding effect for both the driver and other road users, severely limiting visibility.

Using low beams ensures that your headlights shine downward, illuminating the road directly in front of you without creating excessive glare. This makes it easier to see road markings, signs, and obstacles, while also making your vehicle more visible to others.

Driving at the speed limit in fog is not advisable, as the visibility conditions often call for a much slower speed to ensure safety and reaction time. Turning off your headlights is also unsafe, as it would completely eliminate your visibility, making it difficult for you to see and for other drivers to see you.