Stock car racing

Stock car racing is a form of automobile racing found mainly and most prominently in the United States and Canada, with Australia and New Zealand also having forms of stock car auto racing. Traditionally, races are run on oval tracks measuring approximately 0.25 to 2.66 miles (0.4 to 4.3 kilometers). The world's largest governing body for stock car racing is the American NASCAR, and its Sprint Cup Series is the premier top level series of professional stock car racing. Top level races typically range between 200 to 600 miles (322 to 966 km) in length.

Top level stock cars reach speeds in excess of 200 mph (322 km/h) at speedway tracks and on superspeedway tracks such as Daytona International Speedway and Talladega Superspeedway. Contemporary NASCAR-spec top level cars produce maximum power outputs of 860-900hp from their naturally aspirated V8 engines. In October 2007 American race car driver Russ Wicks set a speed record for stock cars in a 2007-season Dodge Charger built to NASCAR specifications by achieving a maximum speed of 244.9 mph (394.1 km/h) at the Bonneville Salt Flats.

Auto racing

Auto racing (also known as car racing, motor racing or automobile racing) is a sport involving the racing of automobiles for competition. The main aim of an individual event is to set the fastest time in a set number of laps or time limit. The finishing order is determined by race time, with the fastest time in first place, second-fastest in second place and so on. Any driver failing to complete a race for any reason is deemed "retired", or, more commonly, "out". Retired drivers will have their positions determined by the order in which those retired, with the first to retire finishing last, the next second-last and so on. In most events, a driver's final race position may be classified if he/she completes a certain amount of the race distance, usually just short of completing the full race (for example, in Formula One, a driver's race position is classified if he/she completes 90% of the full race distance). There are numerous different categories of auto racing, each with different rules and regulations, such as compulsory pit stops and car regulations, for all cars and drivers to comply. The continuous exposure of a driver to vibration and G forces in years of automobile racing may have a substantial effect on the high incidence of musculoskeletal disorders.