Sports Car Racing
In sports car racing, production versions of sports cars and purpose-built prototype cars compete with each other on closed circuits.
The races are often conducted over long distances, at least 1000 km, and cars are driven by teams of two or three drivers (and sometimes more in the US), switching every now and then.
Due to the performance difference between production based sports cars and sports racing prototypes, one race usually involves many racing classes.
In the US the American Le Mans Series was organized in 1999, featuring GT, GTS, and two prototype classes, LMP1 (Le Mans Prototype 1) and LMP2. Manufacturers such as Audi and Acura/Honda field or support entries in the Prototype class.
Another series based on Le Mans began in 2004, the Le Mans Endurance Series, which included four 1000 km races at tracks in Europe.
A competing body, Grand-Am, which began in 2000, sanctions its own endurance series the Rolex Sports Car Series.
Famous sports car races include the 24 Hours of Le Mans, the 24 Hours of Daytona and the 12 Hours of Sebring.