Dayton Speedway was a race track in Dayton, Ohio, United States. It has been called the "Fastest 1/2 mile in the world". The track held events for NASCAR, AAA, MARC, ARCA, ASA, and USAC. The track was opened in June 1934 as a flat "D shaped" 5/8 mile dirt track. The original track was a "copy" of the Legion Ascot Speedway.
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