That's a pretty easy 80/20 style solution, sure. That 20% there is the little fact that all the fences and signs in the world don't keep a certain subset of he

That's a pretty easy 80/20 style solution, sure. That 20% there is the little fact that all the fences and signs in the world don't keep a certain subset of headstrong people from e.g. leaving the path and falling into geysers in Yellowstone, or getting too close to wildlife.