US 78 at Georgia SR 124 Improvements

Snellville, GA, United States of America
Georgia Department of Transportation

After studying the extreme traffic conditions on US 78 at SR 124 in Gwinnett County for many years, the Georgia Department of Transportation (GDOT) approached GS&P for solutions that would finally ease the problems and appease concerned community groups who were angered by previous options that would've greatly changed the community's landscape and disrupted historic landmarks.

GS&P evaluated several innovative grade-separated intersection improvements such as an echelon and a center turn overpass, as well as at-grade options including a continuous flow intersection (CFI), a double wide and a split. The team evaluated each option internally and with considerable input from a Citizen’s Advisory Committee made up of vested property owners. After building public consensus, our team proposed the two-legged CFI as the best solution. It would become the first CFI constructed in the state.

The final CFI design not only addressed traffic and community concerns, it did so at a considerably lower price and shorter construction time. Original plans for a full-grade separated solution were estimated at $43 million for construction and right-of-way, and a three- to five-year construction schedule. The CFI reduced the cost to $10 million total, with a two-year construction schedule.

“GS&P effectively managed and coordinated three workshops to develop a mission statement, listen to the committee’s concerns, provide traffic and accident information, educate the committee and to develop viable alternatives."

William N. O’Brien
GDOT Project Manager

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