When are drivers required to switch on their headlights?

Drivers are required to switch on their headlights during various conditions to ensure safety and visibility on the road. At dusk and dawn, natural light can significantly diminish, making it difficult for other drivers to see vehicles clearly. Additionally, when weather conditions require it—such as rain, snow, or heavy cloud cover—using headlights is essential for enhancing visibility and ensuring that other drivers can see you.

Driving through fog is particularly hazardous, as visibility can drop dramatically; hence, headlights are crucial in these situations. In fact, utilizing low beam headlights in fog can improve visibility while minimizing glare. The requirement to use headlights in these varying situations contributes to safer driving practices and promotes awareness on the road. Therefore, the correct choice encompasses all these conditions, indicating that headlights should be turned on at dusk and dawn, during adverse weather, and while driving through fog.