Drivers can use any kind of car in these events. Most people compete in their daily drivers. This separates 70 HP stock Corollas from 600 HP highly modified Camaros. In each class, the lowest time through the course wins. There is a two second penalty for every pylon hit.
Most events have between three and six runs on course.
Many thousands of people autocross each weekend. Autocrossing helps people learn to drive at the limit and have fun with their vehicles. In America there is an autocross within a short driving distance of almost everyone. Follow the links below to learn more about autocrossing. The San Francisco Region SCCA Solo II Page has plenty of information for new and experienced autocrossers.