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What is the National Highway System?
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Which state has the most miles of roads?
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How are U.S. highways numbered?
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Where was the first cloverleaf interchange in the United States located?
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When was the first diverging diamond interchange (DDI) completed in the United States?
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Which city had the first traffic light?
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1. What is a Jersey barrier? 2. Why are manhole covers round?
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1. How do cars, buses, and trucks travel in the English Channel tunnel? 2. What is the world’s longest road tunnel?
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