From left, California Gov. Edmund G Brown Jr., state Senator Alex Padilla and Google co-founder Sergey Brin stand by a driverless car they arrived in at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012. Brown visited Google to sign legislation for driverless cars. The legislation will open the way for driverless cars in the state. Google, which has been developing autonomous car technology and lobbying for the legislation has a fleet of driverless cars that has logged more than 300,000 miles (482,780 kilometers) of self-driving on California roads. (AP Photo/Eric Risberg)

Associated Press
From left, California Gov. Edmund G Brown Jr., state Senator Alex Padilla and Google co-founder Sergey Brin stand by a driverless car they arrived in at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012.  Brown visited Google to sign legislation for driverless cars. The legislation will open the way for driverless cars in the state. Google, which has been developing autonomous car technology and lobbying for the legislation has a fleet of driverless cars that has logged more than 300,000 miles (482,780 kilometers) of self-driving on California roads. (AP Photo/Eric Risberg)
From left, California Gov. Edmund G Brown Jr., state Senator Alex Padilla and Google co-founder Sergey Brin stand by a driverless car they arrived in at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012. Brown visited Google to sign legislation for driverless cars. The legislation will open the way for driverless cars in the state. Google, which has been developing autonomous car technology and lobbying for the legislation has a fleet of driverless cars that has logged more than 300,000 miles (482,780 kilometers) of self-driving on California roads. (AP Photo/Eric Risberg)
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