In what situation should you use your headlights during the day?

Using headlights during the day is primarily important in low visibility conditions. This includes situations where fog, rain, snow, or overcast weather can significantly reduce the distance you can see and how well other drivers can see you. Headlights enhance your vehicle’s visibility to others, ensuring that you remain seen on the road despite unfavorable weather conditions.

While it's notable that headlights are typically not needed during bright sunlight or at night (where they are naturally essential), the need to use them in heavy traffic can vary. Just using headlights during heavy traffic does not necessarily address the need for greater visibility in less favorable weather or visibility conditions, which is why low visibility is the most critical factor for their usage during the day.