United States Department of Transportation
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Development of near real time performance measurements for closed-loop signal systems (CLS) using historical traffic data from existing loop detectors and signal timing data.
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2014-10-01
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[PDF-28.96 MB]
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Abstract:The overarching goal of this research project was to investigate the potential for the NCDOT Central Office Signal Timing
(COST) Section to monitor and assess the quality of field deployed closed-loop signal system plans using the data inherent in
the systems. The project is complete and has produced recommendations and deliverables that should enhance the COST
Section’s ability to achieve its mission of developing and maintaining quality signal coordination plans across the state of
North Carolina.
Key findings and conclusions include the identification of a series of monitoring and analysis elements that can be
implemented using the OASIS software detector and split monitor logs. In order to analyze dynamic, cycle-by-cycle
bandwidth, a tool entitled the Dynamic Bandwidth Analysis Tool (DBAT) was developed and provided as a project
deliverable. The DBAT tool was enhanced to provide exhaustive search optimization that identifies offset combinations that
maximize dynamic bandwidth for a given set of split monitor log cycle-by-cycle signal indications. DBAT optimization is
feasible for systems up to four or five intersections in length. An LP formulation was developed and tested that overcomes
the system size limitation. The LP formulation can serve as the basis for future development of an implementable dynamic
bandwidth optimization tool.
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