[jimmy1]

Ok, but seriously I am genuinely curious, what is the reason for the fence in the picture? I see fences like this when I am out in the mountains camping or hiking. Is it to prevent some type of animal from roaming down the roads?

[Jach]

Every fence might be different! Clicking on the picture gives a description of that particular one's history. When I see fences/gates on forest service roads or access roads I presume one reason for them is to limit access. Roads require maintenance, having fewer vehicles driving over one means less maintenance. During winter season a fence could also be there to limit access for the purpose of reducing the need for search & rescue or towing services...

[jmalicki]

One common thing is for cattle to be allowed to graze on public land, and it keeps them from wandering out of bounds...