What must you do when driving in fog?

When driving in fog, using low beam headlights is essential for safety. High beam headlights can actually exacerbate the problem by reflecting off the fog, rain, or snow, creating a glare that can impair your visibility even further. Low beam headlights, on the other hand, are designed to provide better illumination of the road immediately in front of you and help prevent light from being reflected back into your eyes by the fog. This visibility enhancement is crucial in low-visibility conditions, allowing you to see the road more clearly and helping other drivers see you as well.

Turning off all lights is not practical since you need to be visible to other drivers and also see the road. Using only hazard lights is designed for situations where your vehicle may be stationary or in a lane, and is not advisable for driving as it does not provide adequate lighting for navigation. Thus, using low beam headlights is the proper approach when driving in foggy conditions, ensuring both visibility and safety on the road.