Interstate 540

Interstate 540 is an interstate highway spur of Interstate 40 in the United States. In North Carolina, I-540 is the modern perimeter loop of Raleigh, North Carolina. The road is several miles further from downtown Raleigh than Interstate 440, the Cliff Benson Beltline.

Known formally as the Northern Wake Expressway, the "Outer Loop" presently runs from I-40 near Raleigh-Durham International Airport to US 1 northeast of Raleigh. As of 2004, sections from US 1 to US 64 in Knightdale, North Carolina in the east and sections from I-40 to NC 54 and NC 55 is the east are under construction.