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City hearing examines DDI proposal for I-285 and Roswell Road as residents warn of business and pedestrian impacts
Summary
Design consultants presented a scoping-level study that favors a diverging-diamond interchange (DDI) at I-285 and Roswell Road, estimated at $70—5 million; council members urged more neighborhood outreach, said potential parcel displacements (including a gas station) and utility conflicts require detailed survey and mitigation before advancing beyond concept.
Consultants from Gresham Smith told Sandy Springs officials March 17 that the preferred concept for the I-285/Roswell Road interchange is a diverging-diamond interchange (DDI) that produced the highest benefit-cost ratio in a city-funded scoping study.
"This is simply a scoping study with the only deliverable being an approved concept," Joel C. Graves of Gresham Smith told the council, stressing the study does not include preliminary engineering, right-of-way acquisition or construction funding. He said the DDI concept fits within constraints created by planned express-lane infrastructure and estimated the interchange work at roughly $70 million to $85 million.
The presentation reviewed existing conditions—Roswell Road carries about 40,000 vehicles a day through the interchange,…
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