Dirt track racing: http://www.shon-stylish-healthy-organic-natural.com/2016/12/07/dirt-track-racing/

In North America the track surface is composed of any soil, but most racers prefer a track with a clay base. According to the National Speedway Directory there are over 700 dirt oval tracks in operation in the United States. Australian tracks are similar to those in the USA. In Great Britain the oval tracks are normally on grass. In Europe tracks can be built of grass, sand or cinder.

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