Google has expanded its self-driving car project testing to the Phoenix, Arizona metro area. This will be the fourth city in the U.S. that will have the company's driverless cars on the road.
Google began testing self-driving car prototypes near its home base in Mountain View, California several years ago. In mid-2015, it expanded to Austin, Texas and earlier in 2016 it began testing those cars on the roads of Kirkland, Washington.
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