If I had private property surrounded by state forest I wouldn't want oeople using my track to get through. Why because oeople will rip my track up in the wet and it'll cost me a dozer to get my track useable. People will dump rubbish or burn out cars (you might nit but other people will) if I run livestock people will poach my animals or leave gates open. If it's my hunting property you may get struck by a stray bullet if you cross my path while hunting. Is it really worth pissing oeople off over the use of this road? Surly there are other roads to get into the forest.
As an example our farm in stanthorpe is at the end of a windy single track dirt road. We use to have a cattle grid and keep out private property signs. Do you think people turned around? No it's people like you who think they have a right to use these roads. After things started going missing bad we were over telling people to leave we build big gates.
You may think what you like but most people are carnts these days and farmers and people who want privacy are over it costing them money so you can go down a track.
How would you like me walking or driving through your yard checking out what you got then say oh sorry I saw the sign but I thought it would be ok as I want to just get over there or I felt like it.