Perimeter (Atlanta)

Interstate 285
The Perimeter
Route information
Maintained by GDOT
Length:	63.98 mi (102.97 km)
Existed:	1963 – present
Major junctions
Beltway around Atlanta
	SR 154 / SR 166 near East Point I‑20 in Atlanta I‑75 near Smyrna US 19 / SR 400 in Sandy Springs I‑85 near Doraville US 78 / SR 410 near Clarkston I‑20 near Panthersville I‑675 near Conley I‑75 near Forest Park I‑85 / SR 14 Conn. near College Park
Location
Counties:	Clayton, Fulton, Cobb, Dekalb
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Georgia State Routes Interstate U.S. State ← SR 284 SR 285 → ← SR 406 SR 408 →

Interstate 285 (I-285) is an Interstate Highway loop encircling Atlanta, Georgia, for 63.98 miles (102.97 km). I-285 also carries unsigned State Route 407 (SR 407), and is colloquially referred to as The Perimeter. Suburban sprawl has made it one of the most heavily traveled roadways in the United States, and portions of the highway slow, sometimes to a crawl, during rush hour. It is also signed as Atlanta Bypass on I-75/I-85.

It is estimated that more than two million people use the highway each day, making it the busiest Interstate in the Atlanta metropolitan area.

I-285 is eight to 12 lanes wide, with the northern part from I-75 to SR 400 to I-85 the most heavily traveled. One segment of the highway near Spaghetti Junction (a large, flyover highway interchange northeast of Atlanta) with I-85 widens to 18 lanes, including collector-distributor lanes. Exits are numbered clockwise, starting at the southwestern-most point at I-85, and ending just east of there where it meets I-85 again near Hartsfield–Jackson Atlanta International Airport.

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Wikipedia