FILE - In this Wednesday, Sept. 14, 2016, file photo, a self-driving Uber car stops at a red light on Liberty Avenue through the Bloomfield neighborhood of Pittsburgh. In just a few years, well-mannered self-driving robotaxis will share the roads with reckless, law-breaking human drivers. The prospect is causing migraines for the people developing the robocars and is slowing their development. But experts say eventually the cars will coexist with human drivers on real roads. (AP Photo/Gene J. Puskar, File)
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