Well I ran into 2 teenagers on 4-wheelers on Saturday ., had never seen them before. I rode right up in front of them and stopped.
The look on their face IMMEDIATELY told me that they KNEW they were not supposed to be there.
They were very polite which is good, so I was equally polite. They said "my grandpa told us those signs were probably just for insurance reasons this land has been open for years."
I educated them otherwise and asked if they could spread the word, that I understood the history but things have changed.
Later that day I had my neighbors wh have the adjoinig 60 acres over for some hot dogs and beer and asked them how long it took after they purchased for the "word" to really get out and when they stopped having problems. Answer: 3 years