When are drivers required to use headlights?

Drivers are required to use headlights during rain, fog, or when visibility is poor because these conditions can greatly reduce how far a driver can see. Headlights improve visibility not only for the driver but also help other road users see the vehicle. In instances of adverse weather, such as rain or fog, using headlights ensures that the driver has better visibility of the road ahead and can better identify obstacles, pedestrians, or other vehicles. This practice is essential for maintaining safety on the road and is often mandated by law in many regions, including Nevada.

While it might seem intuitive that headlights are only necessary at night, relying solely on nighttime usage disregards the importance of visibility in varying weather conditions. Additionally, headlights are not just for instances involving oncoming traffic; their primary function is to ensure that the driver can see and be seen in all circumstances where visibility is compromised. Therefore, the correct response highlights the necessity of using headlights under specific conditions that affect visibility.