page_title: Georgia State Route 400
section_title: I-285 Interchange
hierarchical_section_title: Georgia State Route 400 / Future / I-285 Interchange
context_page_description: Georgia State Route 400 is a freeway and state highway in the U.S. state of Georgia serving parts of Metro Atlanta. It is concurrent with U.S. Route 19 from exit 4 until its northern terminus south-southeast of Dahlonega, linking the city of Atlanta to its north-central suburbs and exurbs. SR 400 travels from the Lindbergh neighborhood in the Buckhead district of Atlanta, at Interstate 85, to just south-southeast of Dahlonega. Like the Interstate highways, it is a limited-access road, but unlike the interstates, the exit numbers are not mileage-based, they are sequential. Once SR 400 passes exit 17, it changes from a limited-access freeway into an at-grade divided highway with traffic lights, but still with a high speed limit of 65 miles per hour, and ends at the J.B. Jones Intersection at SR 60/SR 115 in Lumpkin County.
  Between I-85 and I-285, SR 400 is designated "T. Harvey Mathis Parkway", after a local land developer and road proponent who died the day after being appointed as head of the Atlanta Committee for the Olympic Games in June 1991, when the tollway was under construction. Upon reaching the Perimeter and beyond, the highway is designated "Turner McDonald Parkway".
context_section_description: GDOT, working with North Perimeter Contractors, began construction in February 2017 at the SR 400/I-285 interchange to add collector-distributor lanes and flyover ramps to ease congestion at the interchange. The interchange currently sees 420,000 drivers each day, despite that the current interchange was designed to accommodate 100,000 drivers daily. The project is expected to cost $800 million and is estimated to save drivers on SR 400 and I-285 a combined 20,000 of driving time each day. The project will also include:
  The conversion of the SR 400 and Abernathy Rd (exit 5) to a diverging diamond interchange.
  The reconstruction of the Mount Vernon Hwy bridge over SR 400, the Peachtree Dunwoody Rd bridge over I-285, and the Glenridge Dr bridge over I-285.
  The construction of multi-use paths along the southeastern portion of SR 400 and I-285, and path improvements along Mount Vernon Hwy and Abernathy Rd. These improvements will also connect to Path 400.
  The project will cost $800 million and is expected to be completed mid to late 2020.
caption: The I-285 and I-85 interchange, known as Spaghetti Junction, in GA. After completion of construction, the I-285 and SR 400 interchange will look similar to this.
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