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Herbert competed in various racing series beyond Formula One and Le Mans. These included the DTM (Deutsche Tourenwagen Masters), where he raced in 1994 and achieved two podium finishes. He also participated in the FIA GT Championship (later known as the GT1 World Championship) in 2005, securing one race victory. Furthermore, Herbert ventured into sports car racing, competing in the American Le Mans Series and the 24 Hours of Daytona.