California Gov. Edmund G Brown Jr. signs a bill for driverless cars as state Senator Alex Padilla, center, and Google co-founder Sergey Brin, right, look on at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012. 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
California Gov. Edmund G Brown Jr. signs a bill for driverless cars as state Senator Alex Padilla, center, and Google co-founder Sergey Brin, right, look on at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012.  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)
California Gov. Edmund G Brown Jr. signs a bill for driverless cars as state Senator Alex Padilla, center, and Google co-founder Sergey Brin, right, look on at Google headquarters in Mountain View, Calif., Tuesday, Sept. 25, 2012. 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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