Doug was an expert on the business side of baseball before his untimely death, but I guess you could also call him a road enthusiast. I visited Doug's site years ago and dug some of his pictures; especially of neon roadside sign. I was pleasantly surprised to see that the Society for American Baseball Research now hosts his old site.
http://roadsidephotos.sabr.org/index.html
If you like signage other than DOT signs, you may dig his pix.
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Froadsidephotos.sabr.org%2F66%2Fsigns%2FAZ14.jpg&hash=512a658bf4894d669285c8806d8c775c79de6c26)