This has me written all over it..... might be fun to see how many are left if we flew the route...
http://www.messynessychic.com/2013/11/15/the-forgotten-giant-arrows-that-guide-you-across-america/
http://www.messynessychic.com/2013/11/15/the-forgotten-giant-arrows-that-guide-you-across-america/