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Traffic Signal System Offset Tuning Procedure Using Travel Time Data

Shoup, Gary, E. M.S.C.E., Purdue University, December 1998. Traffic Signal System Offset Tuning Procedure Using Travel Time Data. Major Professor: Darcy Bullock, P.E. Vehicle reidentification equipment and algorithms are approaching the point where collection of real-time arterial link travel time data will soon be possible. Such equipment will provide a new way for traffic control systems to automatically measure their performance and adapt in real-time to the actual traffic demands on the system. Using the concept of link travel time data, this thesis presents the concept necessary to implement an online algorithm which can adapt offsets for a coordinated-actuated traffic signal system. The offset tuning procedure is based on observing individual vehicle travel times in a microsimulation traffic model. Establishing offsets in this manner mitigates the “early return to green” problem associated with coordinated-actuated signal systems and accounts for downstream queues which may negatively impact progression. Further, an arterial analysis procedure is developed to graphically evaluate and document arterial signal timing performance. The procedure provides a rational process to account for stochastic conditions occurring with vehicular traffic and coordinated-actuated traffic controllers.