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Stock car racing is primarily an American and British sport held on oval tracks, up to 4.5 kilometres in length.
A stock car was originally a car that has not been modified from its original factory setup. However, this was changed (in the interest of safety), due to the extreme forces that the cars and drivers experience. Modern 'stock' cars now have completely different chassis and equipment to ordinary vehicles and only bear a slight resemblance to their ordinary, showroom bought cousins.
'True' stock car racing, which uses only automobiles that can be bought by the public, is sometimes called showroom stock racing.
The NASCAR championship is famous all over the world, averaging around 200,000 spectators for each race. Nascar also runs the Busch Series, for junior leaguers, and the Craftsmen Truck Series, using trucks.
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