Run on the WWII era concrete runways along with modern road course, Sebring is considered among the roughest, toughest tracks used for professional road racing. Teams from series around the world use Sebring Raceway to test their cars to the limit, including WEC, IndyCar, TransAm and many others. Audi would run a 24 hour test, in preparation for LeMans, right after the Sebring race.
