I want this in the US so badly. Thrice now I've had my commute double because somebody fenced off a trail and now I have to go the long way around.
There are legal routes for public agencies to purchase portions of land to create routes for transportation, including pedestrian paths, that ensure you're at least paid for the lost property. If there is a need, then lobbying your mayor or council is the way to go about this. That's a lot less risky than letting anyone enter your property anytime for any reason as long as they say they're on a nature walk or something.
Although there's one fence in particular, around an apartment complex parking lot which I cut through to go to the grocery store, which I've been dismantling. They've repaired it three times so far, we'll see who gives up first.