Polarized lenses can block horizontal light coming from the road, the hood of a car, and water surfaces. When you hold these two kinds of sunglasses up to a sunny road or path you may find that the differences between the two types of lenses are quite apparent. You'll notice immediately that the polarized sunglasses can reduce glare on the surface of the road or path and enable you to clearly distinguish between textures and lines. So the polarized sunglasses are especially good for driving on sunny days.