FILE - In this Tuesday, Dec. 13, 2016, file photo, an Uber driverless car waits in traffic during a test drive in San Francisco. 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/Eric Risberg, File)
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