When must a driver use headlights under normal weather conditions?

Using headlights is essential for safety and visibility. The correct answer indicates that drivers must turn on their headlights from a half hour after sunset until a half hour before sunrise. This timing is crucial because driving in low light conditions can significantly impair visibility, making it difficult to see other vehicles, pedestrians, and road signs. Therefore, headlights are required to enhance the driver's ability to see and be seen by others on the road.

While visibility can be low at other times, such as during inclement weather or when driving through construction zones, the specific rule about using headlights during twilight hours is focused on ensuring safety during periods of natural darkness. The other options do not capture this essential requirement linked to the natural light cycle.