"Millions of miles" of testing are still ahead, but Google is talking to car companies about potential partnerships that could bring self-driving vehicles to market within the next decade. Keep in mind that the major auto makers are already working on their own approaches to automated driving. From the WSJ:
Google hasn't decided how it could market a self driving car system, [said Anthony Levandowski, head of the Google project]. While the main challenges relate to software, he said, there are hardware issues, such as the cost and reliability of sensors to detect hazards around the car. Among the options, he said, are partnerships with automakers, offering systems as aftermarket installations, or possibly giving self driving technology away for free as a way to drive use of other Google services. "I'm not suggesting we're going to do that," he added.