Irvine has auto race tracks. Auto racing is a popular sport in the country, and a number of states have racing tracks of various types. The kind of track varies with the kind of racing, such as dirt ovals, drag strips, paved ovals, road courses and temporary circuits. The racing track surface also varies greatly, depending on the kind of racing that happens there. Some popular surfaces include clay, asphalt and concrete. The world of racing has its own rules, jargon and regulations. Irvine may have one or more different racing tracks. Ovals of more than one mile are called superspeedways, as one can race at higher speeds without bends. Most racing tracks for NASCAR are superspeedways.