When are you required to use headlights in Arizona?

The requirement to use headlights in Arizona is primarily focused on ensuring visibility and safety on the roads. You are required to use headlights from sunset to sunrise, which encompasses the hours of darkness when visibility is significantly reduced. Additionally, during adverse weather conditions such as rain, fog, or snow, using headlights is also mandatory to enhance visibility for both the driver and other road users. This combination aims to promote safety by ensuring that all vehicles are more visible under conditions that could impair sight.

While headlights are essential during inclement weather and at night, the specific mention of both nighttime use and adverse weather in the correct answer captures the comprehensive guidelines set forth for headlights usage in Arizona. This ensures clarity about the conditions under which headlights must be utilized for safe driving.