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<br />Traffic Signal System Improvements <br />To further improve traffic signal operations and signal timing efficiency along West 11th Avenue, <br />advanced traffic signal timing methods can be implemented. One method that has proven to be beneficial <br />is adaptive traffic signal control. <br />Adaptive traffic control systems, such as SCATS31, operate in real-time, adjusting signal timing <br />parameters (splits, cycle length and offsets) at each intersection based on variation in traffic demand and <br />system capacity. Adaptive traffic signal control can automatically respond to special events or other <br />unpredictable incidents that cause significant changes in traffic volumes and speeds without intervention <br />by a traffic engineer because the system constantly monitors the level of congestion. Adaptive traffic signal <br />control does not use pre-programmed plans, instead changes splits, offsets, and cycle lengths based on <br />current traffic conditions. <br />Adaptive systems rely on good vehicle detection, a central computer and constant second-by-second <br />communication to intersection controllers. The central computer processes data collected from all traffic <br />signal controllers in the system in real time and sets the cycle length, splits and offsets for each signal <br />controller. <br />Previous studies have shown that adaptive traffic control has substantial benefits over a non-adaptive <br />system, including reducing delay and travel time by 5-30 percent. The cost for an adaptive signal system <br />has been estimated to be $50,000 per intersection. This cost includes modification to the detection and <br />communications systems, the cost of licensing and the cost to configure the intersection within the central <br />software. <br />Recommended Improvement Cost Estimates <br />Preliminary planning level cost estimates were developed for the four recommended improvements by <br />OTAK for both the ODOT and City of Eugene intersections. Cost estimates are summarized on Table 8-3. <br />Table 8-3: Recommended Improvement Cost Estimate Summary <br />Alternatives <br /> Cost Estimate <br />ODOT Intersections <br />th <br /> <br />West 11 Avenue/Beltline Road <br /> <br />West 11th Avenue/Terry Street <br />City of Eugene <br /> <br />West 11th Avenue/Bailey Hill Road <br /> <br /> West 11th Avenue/Seneca Road <br /> <br /> <br />31 <br /> Sydney Coordinated Adaptive Traffic System <br /> <br /> <br />th <br />West 11 Avenue Corridor Study September 4, 2009 <br />City of Eugene P07265-003-000 <br />64 <br />