Interstate 540 (North Carolina)
Interstate 540 (I-540) and North Carolina Highway 540 (NC 540), also known as the Raleigh Outer Loop, is a partially-completed beltway around the city of Raleigh, North Carolina, United States. When complete, it will fully encircle the city and nearby suburbs, meeting its parent route of I-40 in two locations.
Source: Wikipedia — Interstate 540 (North Carolina) (CC BY-SA 4.0)