I don't know. Around here the private property gates are either tied on the top and bottom and not easily slipped right off or have a small lock on them - I don't go through them. But as you can see those gates were very easy to go through and the roads were on the county maps and google maps and there were no "No Trespassing" signs. If I thought they were private property I wouldn't of ridden on them.
I do appreciate the concern though.