Google co-founder Sergey Brin gestures after riding in a driverless car with California Gov. Edmund G Brown Jr., left, and state Senator Alex Padilla, second from left, to 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 Brin gestures after riding in a driverless car with California Gov. Edmund G Brown Jr., left, and state Senator Alex Padilla, second from left, to 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 Brin gestures after riding in a driverless car with California Gov. Edmund G Brown Jr., left, and state Senator Alex Padilla, second from left, to 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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