Which equipment on passenger vehicles helps improve visibility during rain?

Windshield wipers are essential for maintaining visibility during rain. They are specifically designed to clear water, mud, and debris from the windshield, allowing the driver to see clearly through the glass. When it rains, the accumulation of water can obscure vision, making it difficult to judge distance and see other vehicles, pedestrians, and road signs. By effectively wiping away the rain, windshield wipers ensure that the driver has an unobstructed view of the road, thereby enhancing safety.

While other options contribute to driving safety in different ways, they do not directly address the issue of visibility during rain. Rearview mirrors help you see behind the vehicle, headlights improve visibility in low light conditions, and brake lights signal to other drivers when you are slowing down or stopping, but none of these are primarily designed for clearing rain from the windshield. Thus, windshield wipers are the crucial equipment for improving visibility specifically during rainy conditions.