When are drivers required to switch on their headlights?

Answer: D — All of the above

Drivers are required to switch on their headlights under various conditions to ensure safety and visibility on the road. Headlights must be turned on not just at night but also during twilight hours, such as dusk and dawn, when light levels can be insufficient for safe driving. Furthermore, headlights are essential during times of poor visibility, which can be caused by weather conditions such as rain, fog, or snow. In such situations, visibility can be significantly reduced, making it harder for drivers to see other vehicles and for those vehicles to see them. Therefore, using headlights in all these circumstances—nighttime, dusk, dawn, and poor visibility—enhances safety for all road users and adheres to traffic laws designed to promote responsible driving.