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When Robert Roy was helping to create the world’s first self-driving construction truck, he traveled across the country and talked to people in the construction industry. One of the people he spoke with, the president of a company in Louisiana, told him the story of how one of his employees almost died while working on a highway.

A U.S. House committee July 27 approved legislation to give the federal government final say over the performance of self-driving vehicles, a measure that would preempt states from trying to set their own standards.