What should you use when driving in heavy rain to improve visibility?

Using low beam headlights in heavy rain is essential for improving visibility while driving. Low beam headlights are designed to provide adequate illumination of the road directly in front of the vehicle without causing excessive glare for other drivers or reflecting off the water on the road. This is particularly important during rain, as the water can create a reflective surface that may scatter light from high beams, making it more difficult to see.

Furthermore, when visibility is reduced, it's crucial to use lights that will help you see and be seen without impairing the visibility of others. High beam headlights can create significant glare due to the reflection of light off the raindrops and wet surfaces, making it harder for everyone on the road to see. Parking lights and hazard lights do not provide sufficient illumination for driving conditions and are not recommended for enhancing visibility while driving. Using low beam headlights is the most effective practice for safe driving in heavy rain.