During what circumstance should headlights always be on?

Answer: C — In foggy or rainy conditions

Headlights should always be on in foggy or rainy conditions to enhance visibility for both the driver and other road users. In these weather scenarios, standard visibility can be significantly reduced, making it difficult to see the road ahead and be seen by others. Using headlights helps illuminate the surrounding area, making it safer for the driver to navigate and allowing other vehicles to spot them from a distance. In addition, the use of headlights in such conditions can reduce glare, which is particularly beneficial in fog. Fog can reflect light back toward the driver, and low-beam headlights are typically most effective in penetrating fog compared to high beams, which may not be as helpful. This practice is recommended not just for personal safety but also for the safety of others on the road, as it creates a more visible driving environment.