I live a couple of miles down a private dirt road, three families are full time residents and two aren't.
Gate, signs, fake and real cameras, warning people, it makes little difference, people drive down to fish.
I maintain the road, and in the winter the trespassers are using the road five times as much as the residents. The road gets torn up pretty bad during the freeze and thaw cycles.
When confronted they all claim to be friends of residents, we must be the most popular people in the state to know all these people. Although most aren't able to remember the name of the close friend that said it was OK to be there.
They also put trash in our dumpsters which are down the private road a bit. I'd rather they throw stuff in the dumpsters than leave it on beach, but I don't think computer monitors and household trash was stuff they used while fishing.