Cobb County Government


Cobb County Government will open as usual Monday, but everyone is urged to use caution. Cobb and Marietta Schools are closed Monday.

Be Prepared for Winter Weather


How do traffic signals work?

Traffic signals utilize an electronic controller to assign the right-of-way to a particular traffic movement, vehicular and pedestrian, based on a signal timing plan. All traffic signals in Cobb County include vehicle detection typically in the form of an inductance loop in the pavement or a video camera to optimize traffic flow and minimize delays. The traffic signal controller is programmed to reduce time or skip time for a phase of traffic or traffic movement based on input from the vehicle detection equipment. Some signals operate in a system or collection of signals in a coordinated manner to further optimize traffic flow through a corridor or in an area; some operate independently from other traffic signals. Generally coordinated systems favor the predominant direction of traffic flow.