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Here is an aerial  shot of the old Studebaker Test Track in New Carlisle, Indiana, about 12 miles east of South Bend.  You can still make out the trees next to the track that spell out the word "Studebaker."  It is now known as the Bosch Proving Grounds.  Here's a Wikipedia history of the track.  The track was repaved in 2007 according to this story.