In Sacramento, Stanford University's self-driving car hit 120 mph in a test drive, and in Ann Arbor, Mich.

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The U.S. Department of Transportation today is launching an important road test involving 3, 000 vehicles in and around Ann Arbor, Mich.

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The National Highway Traffic Safety Administration agrees, of course, which is why it recently launched the first real-world test of vehicle-to-vehicle communication near Ann Arbor, Mich.

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