What is the legal requirement for using headlights in the state of Nevada?

In the state of Nevada, the law mandates that headlights must be used from sunset to sunrise and during adverse weather conditions that impair visibility, such as rain, fog, or snow. This requirement is designed to enhance safety on the roads by ensuring that vehicles are visible to others during low-light conditions and when visibility is compromised due to weather.

Using headlights from sunset to sunrise helps illuminate the road ahead and make the vehicle more visible to oncoming traffic and pedestrians. Additionally, in adverse conditions, the use of headlights improves the driver's ability to see and be seen, reducing the risk of accidents. This regulation reflects a comprehensive approach to road safety, emphasizing that visibility is crucial at all times when lighting conditions are poor.

The other options suggest either limited use of headlights or an inappropriate requirement for their usage, which does not align with Nevada's traffic laws focused on safety and visibility.