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During the actual rally, the co-driver reads the pace notes aloud (using an in-helmet intercom system) to the driver, enabling them to complete each stage as quickly as possible. Competition is based on lowest total elapsed time over the course of an event's special stages, including penalties. These races are often conducted over long distances, at least 1,000 km , and cars are driven by teams of two or more drivers, switching every few hours. Due to the performance difference between production-based sports cars and purpose-built sports prototypes, one race usually involves several racing classes, each fighting for their own championship. For amateur drivers, the SCAA and the National Auto Sport Association have a few production car racing series to compete in. These series are categorized by vehicle age, engine displacement, vehicle weight, and modification level. The sport soon blossomed in Southern California, and quickly spread around the world. A large proportion of profe