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I-285-SR 400 Corridor Improvements, Atlanta, Georgia

Atlanta, US

I-285-SR 400 Corridor
  • $

    DB Cost

  • 10.5


The I-285/SR 400 Interchange Improvement Project will improve 4.3 miles of I-285 from west of Roswell Road to east of Ashford-Dunwoody Road and 6.2 miles along SR 400 from the Glenridge Connector to Spalding Drive. The Improvements include eastbound and westbound collector-distributor lanes on I-285 and northbound and southbound collector-distributor lanes on SR 400.

Key improvements to the I-285/SR 400 Interchange Reconstruction project in Atlanta, GA include collector-distributor lanes along 4.3 miles of I-285 and 6.2 miles of collector-distributor lanes on SR 400. The collector-distributor lanes will connect through a series of flyover ramps creating a new interchange connecting the major interstate bypass and major state route.

Built for the State Road Tollway Authority, the interchange connects nearly 100,000 residents and an additional 123,000 employees to home, shopping or work at one of the 5,000 companies located in the north metro Atlanta region.

The I-285/SR 400 Interchange Reconstruction project also encompasses smaller key projects that will help improve traffic conditions for the busy metro region. One of the improvements includes expanding and lengthening Mount Vernon Highway bridge over SR 400 and constructing a diverging-diamond interchange on Abernathy Road at SR 400.

Upon its final completion in spring 2022 the interchange reconstruction project and its smaller projects will bring some relief for the 420,000 vehicles that use the interchange daily. The full impact of the project won’t be felt for more than a decade.


  • 33 Bridges
  • 42 lane miles
  • 148 retaining walls
  • 16 sound barriers  
  • 400K vehicles pass through the interchange each day


  • Reduce traffic congestion
  • Improve traffic flow
  • Enhance Safety
  • $146.4M in increased economic output
  • 3,715 jobs created beyond construction

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