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One time I was in my backyard in Lewiston ME and heard racing engines in the distance. It sounded like they were going around a track the way the doppler shifting was happening. I didn't know of any racetracks nearby, but I knew there was a place they advertised on TV called Oxford Plains Speedway. No idea where it was, but it wasn't near me. I went inside and got a map, looked it up, and the sound was coming from exactly that direction.
Google Earth tells me it's 14.35 miles from the center of the speedway to my childhood backyard.
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