When is it necessary to use your low beams?

Using low beams in fog is essential because fog can significantly reduce visibility. High beams tend to reflect off the moisture in the air, creating a glare that can actually make it harder to see. Low beams are designed to project light downwards onto the road, which helps illuminate the immediate area without causing excessive reflection from fog, rain, or snow. This increased visibility is crucial for safe driving in such conditions.

It's also important to note that while low beams may be appropriate in various other situations, such as on rural roads at night or when approaching an intersection, their primary purpose in foggy conditions is to enhance visibility while minimizing glare. Hence, low beams are the safer option to use in fog.