There was a lot of excitement in 2012, when the Hiriko car was unveiled at this event at European Union headquarters in Brussels. At the time, the then-president of the European Commission, Jose Manuel Barroso, hailed the car as a trans-Atlantic "exchange between the world of science and the world of business." Zhou Lei/Xinhua/Landov hide caption

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New autopilot features are demonstrated in a Tesla Model S during a Tesla event in Palo Alto, Calif., Wednesday. Beck Diefenbach/Reuters/Landov hide caption

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A pedestrian crosses in front of a vehicle as part of a demonstration at Mcity on July 20, on the University of Michigan campus in Ann Arbor, Mich. Paul Sancya/AP hide caption

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Google X is building a few hundred self-driving cars that have no steering wheel, accelerator pedal or brake pedal. Google hide caption

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Car companies are picking up automobile concepts such as this Lexus SL 600 Integrated Safety driverless research vehicle, shown at the Consumer Electronics Show in early January in Las Vegas. Julie Jacobson/AP hide caption

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