When is it necessary to use headlights while driving?

Using headlights while driving is essential for safety and visibility. The correct answer emphasizes that headlights must be used from sunset to sunrise and during adverse weather conditions such as rain or fog. This requirement ensures that the driver can see the road clearly and that other drivers can see the vehicle, which is crucial for preventing accidents.

Driving at night presents reduced visibility, and headlights are vital for illuminating the road and identifying potential hazards. Additionally, during adverse weather conditions like rain, fog, or snow, visibility can be significantly diminished. In these situations, using headlights not only helps the driver see better but also makes the vehicle more visible to others on the road, increasing overall safety.

The other options do not capture the full scope of when headlights should be used. Saying that headlights are only necessary at night ignores their crucial role during poor weather conditions. Stating headlights should be used only when other drivers have theirs on fails to acknowledge the driver's responsibility for their own safety and visibility. Finally, asserting that headlights are not required disregards fundamental traffic regulations aimed at ensuring safety on the road.