Cobb County Government

Information Resources

With seven busy divisions and a transportation network including roadways, transit, trails and sidewalks and an airport, there is a lot to know about Cobb County DOT. Check out the resources below to learn about our operations, answers to common questions, and more!

Roadway Resources


Diverging Diamond Interchange Flashing Yellow Arrow Roundabout
Diverging Diamond Interchange (DDI) Flashing Yellow Arrow Roundabouts
A Diverging Diamond Interchange is a new type of intersection design that can increase capacity, decrease congestion, and enhance safety.

Two DDIs are planned for Cobb County: Windy Hill Rd/I-75 and Wade Green Rd/I-75.

DDI Fact Sheet
DDI Simulation
DDI White Paper
A flashing yellow arrow is part of a new signal display system that more clearly indicates to drivers when they must yield before making a left turn across traffic.

As of April 2015, Cobb County has 14 FYA signals.

FYA Fact Sheet (2013)
FYA Video (Michigan DOT)
A roundabout is a circular intersection where traffic flows around a center island. Roundabouts enhance safety, are more efficient and have a higher traffic capacity. Cobb County has six roundabout projects (2015).

Info Video (AZ DOT) windows logo
Roundabout Fact Sheet
Cobb DOT Video windows logo
County Line Roundabout windows logo
Villa Rica Roundabout windows logo




DDI Trifold Winter Weather Infographic-1 The
Windy Hill Road Diverging Diamond Interchange Winter Weather Road Safety Transportation Management Center
In January 2016, construction of a Diverging Diamond Interchange began on Windy Hill Road. Keep track of project updates here.

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Winter brings some of the most dangerous road conditions of the year. Cobb DOT wants to you to be safe by using these quick precautions and tips.

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In 2015, Cobb DOT's TMC celebrated the five-year anniversary of its new, state-of-the-art building. Learn more about the DOT's high-tech traffic operations team.

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GIS has been at Cobb County Government for more than 15 years and has 35 employees. At the DOT, GIS helps plan bus routes, roadways and traffic signals. Windy Hill Road is a $48 million, 1.95-mile project designed to combat high accident rates. It is expected to be complete early 2017.
GIS at Cobb DOT Windy Hill Road
Cobb's Geographic Information System (GIS) plays a huge role in supporting Cobb DOT's projects and operations. Check out GIS by the numbers.

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The Windy Hill Road project is a $48 million investment that will transform the corridor. Learn the facts of this five-part project.

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