When I was a little kid, I asked my grandfather what the bumps in the middle of the road (the reflectors) were for. He told me that it was so blind people could drive. It made perfect sense to me, and I believed that for longer than I should have!
interesting, never thought of that before. Las Vegas Nevada (never snows there!) has excellent road infrastructure and these dots are everywhere. You can tell casino dollars and tax dollars are well used in Las Vegas. The roads are very nice.
Bott's dots -- first thing that came to mind was like Dippin' Dots