170 miles – 6-8 hours to drive or 2 days to visit the byway.The Historic National Road stands for adventure, freedom and exploration. A ribbon of roadway from the Chesapeake Bay to the mighty Allegheny Mountains, it is the road that built the nation. Today, you can experience more than 300 years of American culture, including inns, toll-houses, taverns, theaters, parks, and shops along the byway.