Traffic Engineering

County Transportation Engineer: Keith Rohling, P.E., PTOE

Traffic Engineering is a Division of the Transportation and Development Department. Traffic Engineering is responsible for the following duties:

• Designing, installing and maintains all traffic signals
• Maintaining and installing road signs and roadway marking
• Conducting traffic studies for transportation planning and operation enhancements
• Performing traffic accident and traffic volume analyses
• Operating and maintaining an advanced traffic management center

Signing and Marking

The Signing and Marking Section of the Traffic Engineering Division maintains over 26,000 signs and 338 miles of pavement markings across Clayton County (Bobby Lee – Civil Engineer).

Traffic Signals

The Traffic Signals Section of the Traffic Engineering Division maintains a wide array of signal equipment, including:

• 264 traffic signals
• 225 safety flashers
• 141 traffic cameras

Visit GDOT’s 511GA web app to view traffic cameras in Clayton County (Matt Decker – Civil Engineer).

Clayton County Traffic Signal Design Guidelines

Traffic Signal Design Guidelines (zip) (875KB)– Complete Set

• Material List-Field Wiring Plan Example (pdf) (653KB)
• Signal Inventory Checklist – Rev. Oct 2004 (pdf) (43KB)
• Traffic Signal Notes – Rev. Oct 2004 (pdf) (81KB)
• Traffic Signal Guidelines – Rev. Oct 2004 (pdf) (170KB)
• Traffic Signal Plan Example (1 of 2) (pdf) (834KB)
• Traffic Signal Plan Example (2 of 2) (pdf) (996KB)
• Wiring Table Plan Example (pdf) (435KB)

IVDS Detection Design Guidelines 2-22-05 (pdf) (75KB)

• IVDS Detail 1 of 3 (pdf) (143KB)
• IVDS Detail 2 of 3 (pdf) (146KB)
• IVDS Detail 3 of 3 (pdf) (79KB)