When must headlights be used in Arizona?

Answer: C — From sunset to sunrise and when visibility is less than 500 feet

In Arizona, headlights are required to be used from sunset to sunrise, and also when visibility is less than 500 feet. This regulation is important for ensuring safety on the road during times of low visibility, such as in fog, heavy rain, dust storms, or even at dusk and dawn when natural light may not be sufficient to clearly see the road and other vehicles. Using headlights when visibility is reduced can help drivers detect hazards sooner and make themselves more visible to others. While headlights are indeed necessary at night, the additional requirement during times of limited visibility emphasizes a proactive approach to safety, ensuring that drivers can see and be seen at all times, regardless of the time of day or weather conditions.