You ever seen somebody driving with sunglasses on in the rain and thought to yourself, that person must be crazy. It's actually not as crazy as you may think to be driving with sunglasses on while it's raining outside. Sunglasses can actually help you drive in the rain. Polarized lenses do a really good job of blocking horizontal glare, which is even intensified by rain on the hoods of cars and on the roadways. So blocking that glare could increase your reaction time and improve your driving performance overall.