Kōsatsu-ba Ruins
(place to display a highly raised bulletin board)

During the Edo period, these places were settled in crossroads or end of bridges, in road junctions, places to take a boat for crossing the river, in the sekisho checkpoints, etc. where there was a lot of transit, to display prohibitions or regulations on highly raised boards so that many people could see them.

（quote from “KŌYA KAIDO” published by the Kawachinagano City Board of Education）