High Quality Content by WIKIPEDIA articles! Interstate 285 (I-285) is a beltway Interstate Highway encircling Atlanta, Georgia, for 63.98 miles (102.97 km). I-285 is also known as unsigned State Route 407 and is colloquially referred to as the Perimeter. It is very heavily traveled, and portions of the highway always slow, sometimes to a crawl, during rush hour. It is also signed as Atlanta Bypass, although suburban sprawl has made it one of the most heavily traveled roadways in the country. I- 285 intersects with Interstate 85 in the northeast (Tom Moreland Interchange/"Spaghetti Junction") and southwest, Interstate 75 in the northwest ("Cobb Cloverleaf") and south, Interstate 20 (Tom Murphy Freeway/Ralph David Abernathy Freeway/Purple Heart Highway) in the east and west, and Georgia 400 (Turner McDonald Parkway/T. Harvey Mathis Parkway) in the north. It also meets one end each of Interstate 675, Langford Parkway ("Lakewood Freeway"), and the Stone Mountain Freeway. For 1.21 miles (1.95 km) in the southwest corner, I-85 occupies the median of I-285, yet the roadways remain separate.