What must motorists do when driving in fog?

When driving in fog, it is essential for motorists to use low beam headlights and reduce speed. Low beam headlights are designed to illuminate the road immediately in front of the vehicle without causing glare that could reflect off the fog and impair visibility. High beam headlights, on the other hand, can create a blinding effect when aimed at fog, making it difficult for the driver to see.

Reducing speed is crucial because fog can significantly decrease visibility, making it more challenging to see other vehicles, road signs, and any obstacles. By slowing down, drivers give themselves more time to react to their surroundings and reduce the likelihood of an accident.

While activating hazard lights can alert other drivers, it is not a substitute for proper headlight use, and maintaining the speed limit may not be safe due to reduced visibility conditions. Therefore, the combination of using low beam headlights and reducing speed is the safest approach in foggy conditions.