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Building a Better Commute

Your guide to navigating projects and construction in Perimeter.
Keep a pulse on major transportation projects currently underway in Perimeter.
Keep a pulse on major transportation projects currently underway in Perimeter.
Transform 285 / 400 Project 285 Lane Reductions
Construction Timeline:
June 2022 – TBD
Traffic Changes:
The I-285 Lane Reductions will not continue as planned for this year and are now scheduled to begin in June 2022. In the meantime, crews will complete work activities throughout the project corridor to provide as much relief as possible before the most painful part of the project.
Transform 285 / 400 Project
Construction Timeline:
2018 – Winter 2022
Traffic Changes:
Lane closures will take place on I-285 and SR 400. Anticipate possible delays, reduced speeds, and detours in some areas.

Starting Jan. 31, 2020, expect overnight road closures from 9 PM – 5 AM.

Daytime traffic pacing may take place occasionally on I-285 eastbound from Roswell Road to Perimeter Center Parkway, I-285 westbound from Chamblee Dunwoody Road to Perimeter Center Parkway, and Perimeter Center Parkway from Lake Hearn Drive to Hammond Drive.

More Information:

GDOT maintains a project website here.

Most Recent Update:

Transform 285 @ 400 Lane Closure Advisory // November 5 – November 15
Abernathy Road Diverging Diamond Interchange (DDI)
Construction Timeline:
June 2019 – December 2021
Traffic Changes:
Closure of one westbound turn lane on Abernathy Road, turning south onto SR 400. Additional modifications are possible in the future and will be shared once available.

Most Recent Update:

November 7, 2021
Transform 285 @ 400 Lane Closure Advisory // November 5 – November 15

Peachtree Dunwoody Road & 285 Bridge Replacement
Construction Timeline:
April 2019 – December 2021
Traffic Changes:
Closure of one northbound lane on Peachtree Dunwoody Road as it passes under I-285. This modification is intended to be constant through the end of the Transform 285/400 project.

More Information:

In addition to replacing and widening the stretch of I-285 that crosses overhead, this project is providing a section of trail that will allow PATH400 to reach the Perimeter area.
Glenridge Drive & I-285 Bridge Replacement
Construction Timeline:
February 2019 – December 2021
Traffic Changes:
Closure of one southbound lane on Glenridge Drive as it passes under I-285. This modification is intended to be constant through the end of the Transform 285/400 project.
More Information:
This project will create an additional turn lane onto I-285 westbound and separate left-turning traffic from northbound traffic on Glenridge. It will also create space for the collector-distributor lanes to pass overhead.
Mt. Vernon Highway Bridge Replacement
Construction Timeline:
2018 – 2021
Traffic Changes:
One lane of travel in each direction on Mt. Vernon Hwy will be in place during construction; phase one of the bridge will be completed and traffic will be routed onto the new bridge. From there, the phase two bridge will be built.

More Information:

The first phase will be completed in Q1 of 2020. GDOT will then switch traffic to the completed bridge and replace the old bridge. This second phase will begin in Q2 of 2020.

Most Recent Update:

July 3, 2018
Road Closure: Mount Vernon Highway between Barfield Road and Peachtree Dunwoody Road // Friday, July 6, 2018 to Saturday, July 7, 2018
GA-400 Express Lanes
Construction Timeline:
2021-2027
Traffic Changes:
TBD – Project in design phase.
More Information:

More project information available here.

Path 400 Extension South from Glenridge to Buckhead
Construction Timeline:

TBD

Traffic Changes:
TBD – Project in design phase.

More Information:

The project will provide a bike/pedestrian route that runs more than 5 miles and serves as a greenway that connects Buckhead to Perimeter. Path 400 will eventually join the Atlanta Beltline, providing a key link to the regional trail network.
285 Merged Lanes (Express Lane)
Construction Timeline:

2022 – 2032

Traffic Changes:

TBD – Project in conception phase.

More Information:

The project will add two new at-grade, elevated, and barrier-separated express lanes in both directions on I-285 between Paces Ferry Rd and SR 400 westbound, between Henderson Rd and SR 400, and north on SR 400 from the Glenridge Connector to the North Springs MARTA station.

Additional information is available here.

SR 400 Northbound Shared-Use Path
Construction Timeline:

TBD

Traffic Changes:

TBD

More Information:

The Transform 285/400 Improvement Project will add nearly one mile of a shared-use path to the Perimeter area. The shared-use path will accommodate both bicyclists and pedestrians and will run along SR 400 northbound, with access points at Johnson Ferry Road and Peachtree Dunwoody Road.

I-285 Top End Express Lanes
Construction Timeline:

TBD

Traffic Changes:
The I-285 Top End Express Lanes will be constructed in two smaller packages to phase construction for improved maintenance of traffic during construction.
More Information:

The proposed project would construct new, barrier-separated express lanes in both directions on I-285 from just south of Paces Ferry Road in Cobb County to Henderson Road in DeKalb County, and along SR 400 from the Glenridge Connector to the North Springs MARTA Station. The proposed express lanes would improve mobility and travel-time reliability along the Top End for drivers and improve connections between regional destinations through express lanes that integrate with the greater metro Atlanta express lanes network.

Click here for the I-285 Top End Express Lanes Toolkit.

Workplace construction resources

Spread the Word

Print and post this Transform 285/400 project fact sheet at your workplace.
Construction-related travel delays can be frustrating, but you can make it a breeze for your employees. Discover simple steps, easy-to-understand strategies and commute support services in our field guide.

Roll Out A Commuter Benefit Program

Guide your employees on alternative ways to work.