Frequently encountered while exploring seasonal roads.
If you look close, near the left fork, there's a sign on the tree. Something like "24 hour video surveillance, no trespassing", that sort of thing.
Which fork is this hoping you won't use? To me, it seems to indicate that proceeding on the left fork would be wrong. But it's not, the left fork is the continuation of the seasonal road ("Not plowed by insert county"). The right fork I think does go into the private property.
The entrance to this season road had No Trespassing signs perpendicular to the road on both sides at its start! (The transition from non seasonal road to seasonal road.)
This isn't isolated. There's a river bend park where the no trespassing signs are more perpendicular to the road rather than parallel, causing you to doubt that you are able to proceed on the road when you can. There are some other seasonal roads that go through kind of hunting grounds (some single private party, some hunt clubs) where there signs are similarly placed.
This is one of the reasons I didn't even consider than we'd end up behind a gate at WT 2017.