<P> These races are often conducted over long distances, at least 1,000 km (621 mi), and cars are driven by teams of two or more drivers, switching every few hours . Due to the performance difference between production - based sports cars and purpose - built sports prototypes, one race usually involves several racing classes, each fighting for their own championship . </P> <P> Famous sports car races include the 24 Hours of Le Mans, the Rolex 24 at Daytona, 24 Hours of Spa - Franchorchamps, the 12 Hours of Sebring, the 6 Hours of Watkins Glen, and the 1,000 - mile (1,600 km) Petit Le Mans at Road Atlanta . There is also the 24 Hours of the Nürburgring on the infamous Nordschleife track and the Dubai 24 Hour, which is aimed at GT3 and below cars with a mixture of professional and pro-am drivers . </P> <P> Production - car racing, otherwise known as "showroom stock" in the US, is an economical and rules - restricted version of touring - car racing, mainly used to restrict costs . Numerous production racing categories are based on particular makes of cars . </P> <P> Most series follow the Group N regulation with a few exceptions . There are several different series that are run all over the world, most notably, Japan's Super Taikyu and IMSA's Firehawk Series, which ran in the 1980s and 1990s all over the United States . </P>

How many types of car racing are there