What must you do when driving in fog?

When driving in fog, using low beam headlights and reducing speed is essential for several reasons. Low beam headlights are designed to illuminate the road directly in front of your vehicle without causing glare that can reflect off the fog, rain, or snow and hinder your visibility further. High beams, in contrast, can create a blinding effect and reduce your ability to see clearly, as they reflect off the fog and create a wall of light.

Reducing your speed is also crucial in foggy conditions. The reduced visibility means you need more time to respond to any obstacles, other vehicles, or changes in the road. Slowing down gives you better control and increases the chances of safely navigating through the fog.

Turning off all lights would make it nearly impossible to see the road or any potential hazards, while parking lights are meant to be used when the vehicle is stationary and do not provide sufficient illumination for driving. Therefore, using low beam headlights and adjusting your speed creates a safer driving environment in fog conditions.