Most pavement markings, such as street centerlines (double yellow), lane lines (skip lines), edge lines and pavement reflectors are installed and maintained by DeKalb County on behalf of the City. It also includes warning signs for school zones, and hazardous road conditions as well as other informational and directional signs. Typical signage includes regulatory signs for speed limit designation, as well as stop, yield, and parking restriction signs. The Engineering Department is responsible for maintenance of traffic signs throughout the City, except those located on state roads. To report a traffic signal problem please notify the Design Environment and Construction Division at 40, or the DeKalb County Traffic Operation Center at 40. However since major changes in traffic volumes and patterns can occur over time, the timing plans for the signals must be adjusted periodically to keep them operating at peak efficiency for new conditions. Most of the traffic signals in the City have traffic sensors (loop detectors) on their approaches to monitor traffic volumes and perform minor adjustments to serve the actual demand. The amount of green time each signal approach receives (the timing plan) is related to the volume of traffic it serves. The traffic signals located within the City limits are operated and maintained by DeKalb County on behalf of the City and the state of Georgia. Each signal is synchronized and timed to facilitate traffic flow along arterial or collector roads, while maintaining an adequate vehicular progression on local roads. Traffic signals located throughout the City, except those on state highways, are linked together and synchronized to form a grid system. The photographs are later analyzed and reviewed by the Decatur Police Department, and a summons is then mailed to the offender. Although the cameras do not photograph the vehicle drivers, it does take clear pictures of the vehicle running the light, including a close-up picture of the license plate. The intersection is equipped with speed detectors and cameras that photograph vehicles running the red light. The City of Decatur installed the State's first fully operational red light camera at the intersection of Clairemont Avenue and Scott Boulevard. These guidelines have been adopted by the State of Georgia and the City of Decatur as well as most traffic agencies throughout the nation. Department of Transportation's Federal Highway Administration. The placement of traffic control devices, such as signals, signs and pavement markings, is governed by the Manual on Uniform Traffic Control Devices (MUTCD) guidelines promulgated by the U.S.
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