BUILDING A BETTER COMMUTE
The latest updates on GDOT’s Transform 285/400 project and its transportation impacts in Perimeter.
The Perimeter CIDs funded sidewalks along Peachtree Dunwoody Rd. under I-285 as part of the Transform 285/400 project that’s improving traffic at Atlanta’s busiest interchange. As of 2025, crews are finishing construction and cleanup! Click below for lane closure alerts and project news.
Under Construction: Transform 285/400
Led by the Georgia Department of Transportation, the I-285 at GA 400 interchange is undergoing a major upgrade over a multi-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 2025.
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.
7 YEARS
The project kicked off in February 2017 and is expected to be completed in 2024.
$800M
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.