Stock car racing is a form of automobile racing found mainly and most prominently in the United States and Canada, with New Zealand, Australia, Mexico, the United Kingdom and Brazil also having forms of stock car auto racing. Traditionally, races are run on oval tracks measuring approximately 0.25 to 2.66 miles. The world's largest governing body for stock car racing is the American NASCAR, and its NASCAR Cup Series is the premier top-level series of professional stock car racing. Top-level races typically range between 200 to 600 miles in length. The cars were originally production models ("stock") but are now highly modified.
