United States Department of Transportation
i
Development of an Actuated Traffic Control Process Utilizing Real-Time Estimated Volume Feedback
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2000-09-01
[PDF-763.24 KB]
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TRIS Online Accession Number:00806850
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Edition:Research Report
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Abstract:The goal of this research was to develop an actuated traffic control process that could use estimated volumes in order to optimally operate the traffic signal in real-time in response to actual traffic demands, or a reasonable estimate of demand. A further goal of this research was to establish the relationship between the traditional control parameter, passage gap and key operating parameters, in order to allow changes in signal operations to be made by means of passage gap adjustments. The relationships between passage gap and cycle length, green splits, and interval length were studied, and the cycle length relationship was formalized mathematically. Results indicated that the volume estimation methodology could be readily calibrated to provide good estimates of traffic volumes by movement. The scope of the research dealt with a 60-foot stop-line detector configuration. The overall study results suggest that this configuration is operationally very efficient for minimizing delay, but provides little "dilemma zone" protection for arriving motorists at low volumes and high speeds.
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