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Chances are good that unless you're a city planner or traffic engineer, the number of hours – minutes, even – most people think about the history and design of the sound walls lining America's freeways is roughly zero. The concrete or cinderblock structures turn into a blur at high speeds, and they're specifically designed to blend into the background. If drivers don't notice the barriers, then the designers have done their jobs. However, a new piece from Medium digs deep into the pr