When should headlights be used?

Headlights should be used in low visibility conditions, such as fog or rain, because they enhance the driver's ability to see the road and make the vehicle more visible to other drivers. In such weather conditions, natural light may be insufficient for safe driving, making it crucial to use headlights to illuminate the area ahead and to signal your presence to others on the road. This practice is essential for maintaining safety and reducing the risk of accidents.

Using headlights solely at night or when a car is in motion does not adequately address the importance of visibility during adverse weather conditions. Additionally, relying on headlights only when there is oncoming traffic overlooks the need for a driver to be able to see clearly at all times. Thus, the correct choice emphasizes the importance of adjusting your driving habits based on environmental conditions for optimal safety.