In a photo provided by Tartan Racing via General Motors a driverless tricked out Chevrolet Tahoe made by GM is driven in a mock city in California with other driverless cars in Nov. 2007. Six teams competed in the 60-mile Pentagon-sponsored race, organized by the Defense Advanced Research Projects Agency, or DARPA, which brought automakers, parts suppliers and university and government researchers together to develop driverless cars. (AP Photo/Tartan Motors via General Motors, Vincent Zeng)

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