In this April 27, 2017, photo, drivers cross a double-yellow line as they queue up for a left turn onto a freeway, near Ann Arbor, Mich. 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/Tom Krisher)
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