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Associated Press
In this photo taken Sept. 25, 2012 file photo, from left, Gov. Jerry Brown, state Senator Alex Padilla and Google co-founder, Sergey Brin arrive at Google headquarters in a driverless car in Mountain View, Calif. For the first time, California's Department of Motor Vehicles knows how many self-driving cars are traveling on the state's public roads. The agency is issuing permits, Tuesday, Sept. 16, 2014 that let three companies test 29 vehicles on highways and in neighborhoods.  (AP Photo/Eric Risberg, File)

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