While driving through the Rocky Mountains earlier this summer I was a little mystified when we began to encounter these hobbit-style overpasses. All I could think of was that they were left over from a defunct theme park or an abandoned super-highway project. Then we saw some that were obviously still under construction, not even overgrown with vegetation yet and I realized this was something new. Then I put this together with the fact that both sides of the highway are lined with fencing about 3 or 4 meters (10-12 feet) high and saw that the fencing also crossed the overpasses and the penny dropped. These overpasses are not for cars, they're so that the wildlife can safely cross the highway. What a nice idea.
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