Common use of Traffic Controller Logs Clause in Contracts

Traffic Controller Logs. A traffic controller monitors detector calls and makes signal timing decisions in real-time. For approaches with advance detectors, traffic volume data can be collected and logged periodically. Table 5-3 provides an example of traffic volume data logged by a traffic controller. Date Time Name Det1 Det2 Det3 Det4 Det5 Det6 Det7 Det8 … 4/14/05 11:30 060 164th SW & Alderwood/Manor 67 35 14 11 52 50 4 24 … Depending on controller type, model, and the operating traffic management system, other event data such as changes in signal control phases and time-stamped traffic calls may be recorded. Phase change times are very valuable data for understanding signal controller decisions. However, such phase change data were not available for the Phase One test because of constraints in the traffic management system used by Snohomish County. Fortunately, some phase change information was logged by the TPRG. By analyzing the TPRG logs, we were able to understand the time associated with each priority phase change during the test period.