When is it legal to operate a vehicle without headlights?

Operating a vehicle without headlights is legal during daylight hours when visibility is good. This is based on the understanding that headlights are primarily required to enhance visibility during low-light conditions or adverse weather. During the day, when natural sunlight is ample and conditions like weather are clear, there is sufficient light for drivers to see and be seen by others on the road.

In contrast, using headlights is crucial during nighttime, in fog, or any time visibility is reduced, such as in bad weather. Therefore, driving without headlights in those conditions would not ensure safety or compliance with traffic regulations. Thus, the correct understanding aligns with option A, emphasizing safe driving practices during appropriate daylight conditions.