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U.S. Transportation Secretary Elaine Chao announces new voluntary safety guidelines for self-driving cars during a visit to an autonomous vehicle testing facility, Tuesday, Sept. 12, 2017, at the University of Michigan, in Ann Arbor, Mich. The new guidelines update policies issued last fall by the Obama administration, which were also largely voluntary. (Max Ortiz/Detroit News via AP)

U.S. Transportation Secretary Elaine Chao announces new voluntary safety guidelines for self-driving cars during a visit to an autonomous vehicle testing facility, Tuesday, Sept. 12, 2017, at the University of Michigan, in Ann Arbor, Mich. The new guidelines update policies issued last fall by the Obama administration, which were also largely voluntary. (Max Ortiz/Detroit News via AP)

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