Ashford Dunwoody DDI

The Perimeter Community Improvement Districts (PCIDs) and the Georgia Department of Transportation (GDOT) redesigned the busy I-285 and Ashford Dunwoody Road Interchange near Perimeter Mall to improve traffic flow and safety.

The DDI is a proven, cutting-edge, low-cost design that provides immediate traffic relief. Under normal, free-flowing traffic conditions on surrounding highways, the I-285 and Ashford Dunwoody DDI reduces traffic delays in evening rush hours up to 20 percent.

The Perimeter DDI is the first DDI in Georgia and is a model for congested interchanges throughout the state.

FAST FACTS:

• Completed in 2012
• $5.6 million project
• $400,000 from PCIDs
• Travel time and gas cost savings = $35.3 million over the life of the project
• 29% overall rate of return
• 30% rate of return for State’s contribution
• 318% rate of return for PCIDs contribution

The Diverging Diamond Interchange (DDI) design shifts the flow of traffic to the opposite side of the road, reduces points of traffic conflict,
and improves traffic flow and safety.