Pathway to an Improved Commute

Your resource for the latest Transform 285/400 updates and its transportation impacts in Perimeter.

Under Construction: Transform 285/400

Transform 285/400

Led by the Georgia Department of Transportation, the I-285 at GA 400 interchange is undergoing a major upgrade over a 4-year coordinated construction period that will add roadway capacity, improve traffic flow, safety and access, and generate opportunity for new investment in the Perimeter area. Construction for the project is scheduled for completion in 2020.

Rendering: Transform 285/400

Major Lane Closure: Peachtree Dunwoody Road

There are construction-related realignments on Peachtree Dunwoody Road implemented on April 29, 2019, that will continue through the end of the 285/400 reconstruction (expected to be completed by end-of-year 2020).

During this construction period, there will be one northbound lane, rather than two, on Peachtree Dunwoody as it passes under I-285. While the alignment of lanes on southbound Peachtree Dunwoody will shift, the number of lanes will remain the same.

Here’s a look at the long-term and final lane changes to Peachtree Dunwoody Road.

Upcoming Major Road Realignment

There are construction-related lane realignments coming soon to Abernathy Road that will continue through until the completion of Transform 285/400. Once made, the lane modifications will allow Georgia DOT crews to begin construction on a Diverging Diamond Interchange (DDI) to shift drivers to the opposite side of the road to improve traffic flow and safety. The DDI is expected to be completed by 2020.

Project Status

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Transform 285/400 By The Numbers

10.5 MILES

includes 4.3 miles of upgrades on I-285, from Roswell Road to Ashford Dunwoody Road, and 6.2 miles on GA 400, from Glenridge Connector to Spalding Drive.


The project kicked off in February 2017 and is expected to be completed in Summer 2020.


in construction upgrades to improve travel conditions and access on the interchange.

20,000 HOURS

Improvements are estimated to save GA 400 and I-285 travelers this total amount each day

Perimeter Community Improvement Districts