When is it necessary to turn on headlights during the day?

Answer: B — When weather conditions require it

It is necessary to turn on headlights during the day when weather conditions require it, such as during rain, fog, or snowy weather, which can significantly reduce visibility. In these situations, headlights ensure that your vehicle is visible to others and help you see the road ahead clearly. This practice enhances safety for all road users and aligns with laws in many places that mandate the use of headlights in poor weather conditions. Using headlights during adverse weather conditions is a crucial aspect of defensive driving, as it reduces the chances of accidents by improving visibility and making your vehicle more noticeable to other drivers.