In basic terms, a stock car is a standard road car that has been modified to make it more suited to racing. Stock car racing is enormously popular in the United States, where the racing series NASCAR is ubiquitous. Races usually take place on oval tracks where the emphasis is placed more on maintaining very high speeds rather than turning or cornering correctly. Some cars can reach speeds of over 200 mph, so stock car racing can be a perfect way to get your adrenaline flowing. Track days at oval circuits are becoming increasingly popular, and itês not hard to see why.