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Associated Press
FILE - This file photo taken Tuesday, May 13, 2014 shows a row of Google self-driving cars outside the Computer History Museum in Mountain View, Calif. California's Department of Motor Vehicles will miss a year-end deadline to adopt new rules for cars of the future because regulators first have to figure out how they'll know whether "driverless" vehicles are safe. (AP Photo/Eric Risberg,File)

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