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The Piedmont Triad, Triad, or North Carolina Triad is a region of North Carolina in the Piedmont that consists of the area centered around the cities of Greensboro, Winston-Salem, High Point, and Burlington. The area is connected by Interstates 40, 85, 73, & 74 and is served by the Piedmont Triad International Airport. Long known as one of the primary manufacturing and transportation hubs of the southeastern United States, the Triad is also an important educational and cultural region and occupies a prominent place in the history of the American Civil Rights Movement. The Triad is not to be confused with the "Triangle" region (Raleigh / Durham / Chapel Hill) directly to the east. As of 2006, the Piedmont Triad has a population of 1,513,576 making it the 30th largest metropolitan area in the USA.