Cobb County Department of Transportation collects and maintains a traffic count database for most roads within the County. The Traffic Count Map is periodically updated and includes counts taken within the last 3-4 years. The counts are the Average Daily Traffic (ADT) which is a 24-hour count of vehicles for both directions of travel. View Cobb Traffic Counts. The Georgia Department of Transportation also maintains a traffic count database for roads within Cobb County. GDOT traffic count data can be viewed at dot.ga.gov.