Racing held on a paved closed circuit with both right and left turns. It is done with both purpose built race cars, and factory models. This class of racing is usually specific to a vehicle type/model (Miata spec racing,
Corvette racing, etc) or a division (
24 Hours of Lemons or Chump car),
NASA,
SCCA, etc which have specific requirements for body type, engine size, horsepower, etc.