Sebring International Raceway in Sebring, Florida is just one of the oldest continuously-operating auto race course in the United States, holding its first race in 1950. Sebring is among the most popular classic race tracks in North American cars racing, and the 12 Hours of Sebring is legendary in the cars circuit. The raceway occupies a section of Sebring Regional Airport, an active airport terminal for personal and business visitor traffic that was originally built as a WWII Military Air Force training base. The initial 12 Hrs of Sebring was held in 1952, and turned into a major international nationality. In 1959, the racetrack organized the first Solution One United States Grand Prix. The 3.7-mile asphalt/concrete roadway program with 17 turns was renowned for its high-speed Turn 17, a long, rugged, quick, ideal turn that can make or crack an auto's rate down the lengthy straightaway.