Yep, where I'm from in the mountains, depending on where something is, you can hear it from ridiculously far away. However, if in a different location, you may not here it until it's right on top of you. For example, at my house, I can hear an ambulance leave the rescue squad which is almost 2 miles away. You can hear it coming up the road, but when it goes through the valley about a mile away, it goes silent. Then, the next thing you know, it comes blaring over the hill. Mountains make sound waves do crazy things.