When should you use your headlights?

The use of headlights is crucial for ensuring visibility and safety on the road. You should use your headlights from sunset to sunrise because it's when natural light diminishes, making it harder for you to see and for others to see you. Additionally, it’s important to use your headlights during inclement weather, such as rain, snow, fog, or heavy cloud cover, as it significantly reduces visibility. Proper use of headlights not only helps you see the road and obstacles ahead but also makes your vehicle more visible to other drivers, which is essential for preventing accidents.

While it’s important to use your headlights in various circumstances, the other options don’t cover the crucial aspects related to safety and visibility. Using headlights only during fog does not account for other low-visibility situations, and using them from dawn to dusk would be unnecessary as there is typically enough natural light during those hours. Using headlights in a parking lot is less critical than ensuring they are used during times of reduced visibility on roadways. Thus, option C encapsulates the broad guidelines for safe driving practices regarding headlight usage.