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They must count on very clean roads in the Netherlands. Snow cover, sanding and other debris would cut down on some of the effectiveness. I can see the benefits of having brighter markings on the road surface to help drivers stay on them, especially rainy and foggy periods, but weather and temperature symbols? Most cars already show outside air temperature. Even without that bit of technology, I sure hope drivers are already aware enough to notice precipitation types and what they might mean as they motor on down the roads!