If visibility is reduced due to fog, which headlights are most appropriate?

Using low-beams in foggy conditions is the most appropriate choice because low-beam headlights provide sufficient illumination of the road directly in front of the vehicle without creating excessive glare. Fog tends to scatter light, and high-beam headlights can actually make visibility worse by reflecting off the fog and causing a blinding effect.

Low-beams are designed to cast a shorter, wider beam that helps drivers see the road and nearby objects without overwhelming the fog with brightness. This is particularly crucial for maintaining visibility of lane markings, traffic signs, and any obstacles, allowing for safer navigation.

Additionally, relying solely on regular headlights without considering the conditions may not provide the necessary visibility, and using parking lights does not fulfill the requirement for adequate roadway illumination. As a result, low-beams are the optimal choice in reduced visibility situations like fog.