Driving a Subaru, Herridge won the Privateer Cup in the Australian Rally Championship in 2000 and 2001. This earned him a factory driver with Subaru Rally Team Australia in 2002. He remained with the team until the end of 2005. He won the Group N category on Rally New Zealand in 2004, and was Australian championship runner-up in 2005.
As a privateer, Herridge finished third overall in the 2006 and 2007 Australian championships, winning the Privateer title in both years. On 2006 Rally Australia, he finished eighth overall and third in the PWRC category. In 2008, he contested the Chinese Rally Championship for Subaru China, also claiming the FIA Pacific Cup title. In 2011, he won the Australian Targa Championship in a Subaru.
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