When is the use of headlights required during the day?

The use of headlights during the day is required in fog, rain, or snow because these weather conditions significantly reduce visibility. Headlights help other drivers see your vehicle, thus enhancing overall safety on the road. When conditions are poor, using headlights ensures that your vehicle is visible to others, and it improves your ability to see the road ahead, as well as any obstacles or hazards.

In fog, rain, or snow, visibility can drop to just a few feet, making it crucial to have your headlights on to avoid accidents. While other options suggest situations where headlights might be necessary, none emphasize the importance of visibility during inclement weather as clearly as this choice does. In heavy traffic, cloudy conditions, or under street lighting, while using headlights is encouraged for safety, it is not a requirement in the same way it is during adverse weather conditions.