During which weather conditions is it required to have headlights on?

Headlights are required to be on during rain, fog, or snow because these conditions can significantly reduce visibility on the road. Utilizing headlights enhances your visibility to other drivers and helps you see better in poor weather conditions. In rain, headlights can help illuminate the road and any potential hazards, while in fog, they can improve the driver's perception and enable safer navigation through limited visibility. Snow can also create problematic visibility, especially during nighttime or in heavy snowfall. Overall, using headlights in these weather scenarios is an important safety measure aimed at protecting both the driver and other road users.