When are headlights required to be used?

Headlights are required to be used from sunset to sunrise and in adverse weather conditions to ensure visibility and safety on the road. During the nighttime, it is essential for drivers to use headlights to see the road ahead and to be seen by other motorists, as light conditions are typically low. Furthermore, in adverse weather conditions such as rain, fog, snow, or heavy overcast, even during daylight hours, the use of headlights helps improve visibility significantly. This requirement is aimed at reducing the chances of accidents by making vehicles more visible to each other, thereby enhancing road safety.

Using headlights only at night, in fog, or while driving at high speeds does not encompass the full range of circumstances that necessitate their use, which is why these options are not correct. For example, using headlights only in fog neglects the importance of using them during adverse weather conditions where visibility is compromised, even if it is not foggy.