When is it advisable to use your headlights during the day?

Using headlights during the day is advisable when visibility is low due to conditions such as fog, rain, or other adverse weather situations. This practice enhances your own visibility and makes it easier for other drivers to see you, which is crucial for safety on the road. Low visibility can occur not only at night but also in daylight hours when weather conditions obscure vision.

While it might be helpful to use headlights on highways to increase visibility, this does not encompass all scenarios where reduced visibility might occur during the day. Additionally, headlights are generally required at night for safe driving. However, the most important scenario for daytime headlight use revolves around weather conditions that significantly impair visibility, which is why that answer is the most appropriate in this context.