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How to increase driving visibility in rain 
Turn your windshield wipers on. 
Unless your car comes with automatic wipers, you'll need to manually activate your windshield wipers to improve driving visibility in the rain. Windshield wipers typically have three different settings: slow, medium, and fast.
Available choices: -- If your wipers don't work correctly, they can block either rain or daylight visibility, which can make visibility more difficult when using your wipers. Your wipers can also stop rain, if the whites of your car are polarized to prevent rain from getting into your headlights.. -- If the rain is light, select the slow speed. If the rain is heavier (and your visibility is poorer), select a faster speed.. -- If you only need to turn on your wipers during a storm, the wipers should also be on automatically. For slow wipers, the wipers should be switched off when you are in a thunderstorm.. -- The slow setting allows you to check for traffic ahead of you and guide turn time. This mode forces you to slow down more slowly and gain better control..
If the rain is light, select the slow speed. If the rain is heavier (and your visibility is poorer), select a faster speed.