What must you do if you are driving in fog?

When driving in fog, it is crucial to use low-beam headlights. High-beam headlights produce a glare when they reflect off the moisture in the fog, which can significantly reduce visibility. Low-beam headlights, on the other hand, provide better illumination of the road directly in front of you without causing additional glare. This makes it easier to see the road and any potential hazards, as well as making your vehicle more visible to others.

Turning off the headlights altogether can lead to dangerous situations since you would be less visible to other drivers and unable to see the road. Driving at a higher speed is also ill-advised in foggy conditions due to the limited visibility and the increased risk of losing control of the vehicle. Therefore, using low-beam headlights is the safest approach when navigating through fog.