Cobb County Government

When should a traffic signal be installed?

Cobb County installs traffic signals when traffic volume and other criteria meet national standards established in the MUTCD. An engineering study, which includes analysis of vehicular volumes, pedestrian traffic, intersection safety and vehicular traffic flow, is performed to identify locations for installation of a traffic signal. Although not common knowledge there are disadvantages when installing a traffic signal and therefore we do not recommend installation when these criteria are not met. Installation of signals not satisfying these criteria may increase delays and congestion, and reduce overall intersection safety.