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The first stop sign was created in 1914 by Detroit police sergeant Harold "Harry" Jackson, who was working as a traffic guard at a busy city intersection. One of the cross streets had a particularly low-visibility turn entering the intersection, almost always forcing Sgt. Jackson to slow down and hold back the traffic entering from that street. Looking for ways to make his job easier, he took a rectangular piece of plywood, cut the corners off of it to give it a distinct shape, wrote "STOP" over the center, and placed it facing the street. He

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