Google co-founder Sergey listens to California Gov. Edmund G Brown Jr. during a bill signing for driverless cars 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
Google co-founder Sergey listens to California Gov. Edmund G Brown Jr. during a bill signing for driverless cars 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)
Google co-founder Sergey listens to California Gov. Edmund G Brown Jr. during a bill signing for driverless cars 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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