Marlboro Motor Raceway
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Marlboro Motor Raceway (MMR) is a now-defunct motorsports park located in Prince George's County, just outside Upper Marlboro, Maryland. MMR closed after the 1969 season and local Sports Car Club of America (SCCA) racing moved to the more advanced Summit Point Motorsports Park due to safety concerns and issues with MMR's management. The remains of the track are still visible from U.S. Route 301 and the entire track layout can still be seen in modern satellite imagery.