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Racing cars now fall into two broad categories: open-wheeled vehicles and closed-wheeled vehicles. Open-wheeled vehicles refers to cars in which the wheels are not enclosed beneath fenders. These cars have open cockpits, although there can be a roll bar or cage over the driver for protection in case of a crash. The cars are streamlined for speed and are single-seated, meaning that only one person can be in the vehicle. They come in varieties ranging from modest karts (small motorized vehicles) to extremely complex F1 and Indy cars. Closed-wheeled vehicles have an enclosed cockpit and so somewhat resemble standard street cars. These automobiles, sometimes called stock cars, are in reality racing vehicles with only the bodywork of a street car. Because they are purpose-built for racing, stock cars are not suited for driving on public streets.
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