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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

Rendering: 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 2021.

Transform 285 @ 400 Lane Closure Advisory // December 27 – January 4

The Georgia Department of Transportation and its partners continue their progress on the Transform 285 @ 400 project.

Weather permitting, GDOT will temporarily close local roads and lanes on I-285 and SR 400 between Monday, December 27 and Tuesday, January 4Click here to view the full closure details.

Crews will also implement multiple detours for the Transform 285/400 Interchange project. Travel restrictions include possible delays, reduced speeds and detours in some areas.

For real-time construction & traffic conditions, visit or download the Georgia 511 app (available in Google Play and Apple App Store).

Postponed: Lane closures on I-285 delayed until June 2022.

The Georgia Department of Transportation (GDOT) has announced that major lane closures slated for I-285 have been delayed. The closures are expected to now take effect June 2022. These closures are intended to accommodate bridge construction.

Now Open: New Access Ramp for Ashford Dunwoody Road

GDOT has also recently opened a new access ramp to Ashford Dunwoody Road from I-285 eastbound. Those exiting at Ashford Dunwoody from I-285 eastbound will need to make this exit much sooner than you’ll be familiar with – please see details about the new access point here.

Construction-Related Lane Closures on I-285

The Transform 285/400 transportation project will soon enter its most transformative stage. To complete construction, the Georgia Department of Transportation (GDOT) will close two left-hand lanes in each direction of I-285, between Roswell Road and Ashford Dunwoody Road. This closure is slated to begin in Summer 2022 and will last until the project’s completion.

After the project is completed, drivers will experience less congestion to and from GA-400 and smoother, easier merging via new collector-distributor lanes.

Project Status

Construction Radar

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285 Westbound to Collector-Distributor Lane to Roswell Road

To access Roswell Road traveling on 285 westbound, merge onto the collector-distributor lane between Peachtree Dunwoody Road and SR 400 to exit at Roswell Road.

285 Eastbound to Ashford Dunwoody

To access the Ashford Dunwoody Road exit traveling on 285 eastbound, merge onto the collector-distributor lane just after Glenridge Drive.

285 Westbound to 400 Northbound

To access 400 northbound traveling on 285 westbound, merge onto the collector-distributor lane immediately after Ashford Dunwoody Rd.

285 West to 400 Southbound

To access 400 southbound traveling on 285 westbound, pass the 400 northbound exit and take the separate 400 southbound exit, immediately after.

400 Southbound to 285 West/East including Ashford Dunwoody

Choose your exit lane to 285 before Hammond Drive. To travel to 285 westbound, choose the far right lane. To travel to 285 eastbound, choose the second lane from the right.

Know when to drive on I-285

We’ve compiled the latest traffic data to create a visual guide of the best and worst times to travel on I-285. Click the links below to find the best travel windows.
Traffic congestion by Hour on I-285 to and from I-85.

You Can Count on Us

You don’t have to navigate construction on your own. From commute planning assistance to handy resources, we’ve got you covered.

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.

10.5 miles

The project kicked off in February 2017 and is expected to be completed in 2021.


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.