Which of the following helps improve a driver's visibility during rainy conditions?

Using automatic windshield wipers significantly enhances a driver's visibility during rainy conditions. This technology automatically detects moisture on the windshield and activates the wipers accordingly, ensuring that the driver's view remains clear without the need for manual adjustment. This allows the driver to maintain focus on the road and surrounding traffic rather than frequently adjusting wiper speeds or settings, which can be distracting.

In addition to improving visibility, automatic windshield wipers adjust their speed based on the amount of rain detected, which helps optimize performance and efficiency—especially during varying weather conditions. This ensures that the windshield is kept clean, reducing the likelihood of impaired vision caused by rain accumulation.

Other options, such as wearing polarized sunglasses or driving with the windows down, do not effectively address the issue of rain on the windshield. Polarized sunglasses can reduce glare but may not enhance visibility through a wet windshield. Similarly, driving with the windows down is not effective for visibility since rain will still impair the windshield and can create dangerous driving conditions. Turning off all vehicle lights would significantly reduce visibility not only for the driver but also for other road users, making it unsafe.