
Quoting
Mr. Knowitall
Public roads are open to the public. Public bridges are open to the public. Arguing, "There's only private property past this point down the public road" does not make the road itself any less public."
If the fisherman are using public land to fish, the issue is not one of trespass. It's more likely one of a statute or ordinance prohibiting pedestrian traffic on particular types of roads. I cannot promise you that a statute or ordinance applies, as I don't know anything about the nature of the road nor what unit of local government (I expect the township) might have ordinances pertaining to the specific stretch of road.