After some thought, I came up with ideas in my head of what these were, could be official(looked it), to warn atv that trucks are on trail?, or a test to see how many people obey the postings? If they are official, how do they plan on controlling it, how can they, with all the trails out there, prevent people from driving on only marked trails? I always stay on trails anyway, but I've seen alot of carnage out there over the years, those people will still be going. I just can't see how they can manage it. If I had the money I would buy a huge pile of land and turn it into a Off-Road park. Just sit around pulling people out all day, what a dream, a small fee of coarse. Could be very popular and prosperous with how things are going.