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I'd love to see any type of reflector integrated into the pavement, but I also realize that many solutions would pose a problem for snow plows in the Winter months.

I've sometimes seen this addressed by building a depression into the road surface, and attaching the cat's eye to the road, in the depression. So long as the highest point on the cat's eye is below the surface of the road, a snow plow won't effect it. On the other hand, the depression needs to be relatively long to make sure you've got a clear shot from your headlights to the cat's eye and back at a suitable distance.