Which of the following is a safe driving practice in fog?

Using low beams and reducing speed in foggy conditions is a safe driving practice because it enhances visibility while minimizing glare. High beams reflect off the fog and can create a white wall effect, significantly reducing a driver's ability to see through the fog. By switching to low beams, drivers can illuminate the road closer to their vehicle, helping them to better see obstacles and other vehicles.

Reducing speed is also crucial in fog since visibility is compromised, impacting reaction times to unexpected situations. Slowing down allows for better decision-making and increased safety as stopping distances may increase in low visibility conditions. This combination of using low beams and reducing speed contributes significantly to maintaining safety on the road when encountering fog.