[Answer] What is the longest road in the United States?

Step 1 : Introduction to the question "What is the longest road in the United States?"

...1. I-75 2. U.S. 20 3. U.S. 10 4. I-90

Step 2 : Answer to the question "What is the longest road in the United States?"

U.S. 20 - Stretching 3,365 miles, U.S. 20 begins in Boston, Massachusetts, and extends all the way to Newport, Oregon. The coast-to-coast route has held the title of the longest road in the country since 1963. Driving from one end to the other would take you through 12 states and Yellowstone National Park — if you’re considering taking an epic cross-country road trip, plan for about a week, assuming you drive 8-10 hours a day. For much of its route, U.S. 20 runs almost parallel to I-90, which at 3,020 miles is the longest interstate highway in the country. In comparison, Route 66 is 2,448 miles long, and the Pacific Coast Highway stretches for just 665 miles.:

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