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From left, California Gov. Jerry Brown, state Sen.
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From left, California Gov. Jerry Brown, state Sen. Alex Padilla and Google co-founder Sergey Brin stand by a driverless car they arrived in at Google headquarters in Mountain View, Calif., Sept. 25, 2012. Brown signed a driverless car bill Tuesday.(Credit: AP)

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Google's driverless car

California Jerry Brown rides a driverless car to Google headquarters in Mountain View, Calif., where he signed a bill establishing safety and performance regulations to test and operate such vehicles in the state on Tuesday, Sept. 25, 2012. Google has been testing a fleet of such computer-controlled vehicles for several years.