High Quality Content by WIKIPEDIA articles! NC 55 is a 192-mile (309 km) North Carolina state highway that serves as a traffic artery connecting Durham to numerous small cities and towns in the The Triangle on its way toward the Pamlico Sound. A portion of NC 55 extends through Research Triangle Park. NC 55 is a major artery in the central part of The Triangle region, and is a four lane, divided highway between Durham and Cary and Apex. NC 55 is also a divided highway between Apex and Fuquay-Varina.