What is the main requirement for headlights when visibility drops due to weather conditions?

Answer: B — Use low-beam headlights

Using low-beam headlights when visibility drops due to weather conditions, such as rain, fog, or snow, is essential for safe driving. Low-beam headlights are designed to illuminate the road immediately in front of the vehicle without creating excessive glare. When visibility is impaired, high-beams can reflect off precipitation, causing blinding glare that hinders visibility for both the driver and oncoming traffic. Moreover, low-beam headlights provide a broader field of view at closer distances, which is crucial when navigating through challenging weather conditions. This enhances safety by allowing the driver to see the road clearly while ensuring that other drivers can also see the vehicle more easily. Therefore, proper use of low-beam headlights is vital for maintaining safety on the road during adverse weather conditions.