An autocross is a test of a driver's ability to maneuver a tight, temporary race course in the shortest amount of time. Competitors are not racing wheel-to-wheel on a track, but through a maze of cones at a parking lot or an old airport. It is popular because it gives people an affordable way to drive at the limits without the cost of many other forms of racing. With more emphasis on skill than machine, many people drive their stock or lightly modded daily drivers to events, rather than trailer in a dedicated race car.

The Sports Car Club of the America holds the most autocross events, under the club name of Solo II. Annually, the SCCA sanctions over 1,000 Solo II events in regions all over the country. Cars are placed in a class with other vehicles of comparable performance and level of modifications.