MoDOT is considering a policy change in regard to those brown signs directing people to historic sites. They are proposing eliminating the signs for any enity or site which draws less than 1 million visitors a year. It seems MoDOT sees these signs as highway clutter.
History was not made at only big events or large places, the smaller spots often have intriquing pasts. I'd think MoDOT has enough to do without getting involved with historic site signs.