I like the idea, but I think it would be really hard to find one of the markers. I have lived all my life on or near a leg of the route, and over the years I have traveled several hundred miles along various roads that are on or near that route, and I have yet to see one of the markers. Maybe they were just destroyed for more development in some areas here in the east, but I would expect some to survive. Any survivors must be well hid because I have never even heard about them.