What action should be taken if the visibility is poor?

When visibility is poor, considering the use of fog lights is the most appropriate action. Fog lights are designed to provide a wide, low beam of light that illuminates the road immediately in front of the vehicle without causing glare for other drivers. This can significantly enhance visibility in conditions such as fog, heavy rain, or snow, making it easier to see the road ahead and any potential hazards.

Utilizing main beam headlights, while beneficial in some circumstances, can create glare in foggy conditions and reduce your overall visibility due to the way the light scatters. Driving with emergency lights on is typically reserved for situations involving breakdowns or emergencies and may not be suitable for improving visibility in poor weather. Increasing speed to clear an area faster is generally inadvisable, as it could lead to loss of control or heightened risk of accidents in low-visibility scenarios. Therefore, using fog lights is the best practice in these conditions to ensure both safety and awareness on the road.