When is a driver required to have their headlights on in Pennsylvania?

In Pennsylvania, the law requires drivers to turn on their headlights from sunset to sunrise and whenever visibility is less than 500 feet. This requirement serves to enhance safety on the road by ensuring that drivers can see and be seen under conditions of reduced visibility, such as fog, rain, or falling snow. The instruction to use headlights during these conditions helps prevent accidents and promotes safe driving practices.

While headlights are indeed a necessity during poor weather conditions, the requirement extends beyond just these instances. The specific mention of both sunset to sunrise and visibility limitations reflects a comprehensive approach to road safety, ensuring that headlights are used appropriately during times when darkness or adverse weather can impair visibility. This combination of factors captures the full scope of when headlights must be utilized in Pennsylvania, which is why this choice is correct.