Our network

Georgia's first DDI gets green light | Transportation

Title (Max 100 Characters)

Georgia's first DDI gets green light
Georgia's first DDI gets green light

ATLANTA -- The Federal Highway Administration has officially authorized construction of Georgia's first Diverging Diamond Interchange (DDI).

This highway improvement will provide a major gateway into the Perimeter area, one of Metro Atlanta's largest business markets, according to the Perimeter Community Improvement Districts (PCIDs).

"The Diverging Diamond Interchange is expected to reduce traffic delays up to a projected 25 percent when it is opened to the public in late summer 2012," said PCIDs president and CEO Yvonne Williams. "This innovation will add interchange capacity without constructing a new bridge by restriping, altering signal timing, improving turning conditions and reconstructing a ramp. It will also improve safety and air quality."

According to Williams, in 2009, PCIDs invested $100,000 to conduct pre-engineering studies and find a new concept for the 40-year-old I-285/Ashford-Dunwoody Road Interchange, one of the most congested intersections in Georgia. The results suggested building a DDI, a design that originated in France and was first constructed in the U.S. in Springfield, Mo. in 2009.

The Metro Atlanta DDI will be the sixth one constructed in the U.S., Williams said.

"The PCIDs are proud of taking an aggressive step to find the DDI design and bring it to Georgia," she said. "This is a proven, cutting-edge design that will allow an interim solution to the congestion at the I-285/Ashford-Dunwoody Interchange until a complete reworking of the interchange can occur."

The Georgia Department of Transportation began advertising the project for construction on June 24. PCIDs said bids will be opened on July 22.

GDOT will primarily fund the construction with federal money.