Abstract
Proper designs of offsets forsignalized intersections in an urban arterial system can help improve the level of service (LoS) significantly. The MAXBAND model has been the most widely used approach for this purpose. In this paper, a MAXBAND model in which the lengt hs of phases in a cycle are variable is proposed. In other words, the lengths of phases in a cycle, as well as the cycle itself, are no longer fixed. Besides, theincorporation oftraffic dispersion module in the proposed model allows that the travel times from upstream intersection to the downstream one are taken into account. Real-world application on an arterial system in Taiwanfor evaluating the performance of the proposed model is conducted to validate the methodology. Actual traffic flow data are collected through on-site experiments. Results suggest that the improvements are around 44%, on average, in terms of total delay of the entire network.
Highlights
An effective signal control strategyis crucial in imp roving the level of service (LoS) fo r coordinated signalized intersections
Neithermodel has considered the lead-lag left-turn ing phases and the queuing clearance times.Gartner et al.4solved the problem by developing a mult iband model thatincorporates the left-turn phase sequence optimizat ion and initial queue clearance t imes .Themajor contribution of multiband model resides in the consideration of the flow volume in the model
Plus,emp irical e xperiments are conducted for evaluating our methodology, and the results suggest that the performance of our model co mes with an improvement being around 44% on average, in terms of total control delay per minute
Summary
An effective signal control strategyis crucial in imp roving the LoS fo r coordinated signalized intersections. Yang et al.11proposed a multi-path progression model featuring the optimizat ion of the phase sequences and the determination of crit ical paths in the associated network This model can handle the intersections with high turn ing volumes on the minor legs by adding a new path through the arterial. A major restriction in Yang’s model resides in that the length of the co mmon cycle, as we ll as that of the phases, for the coordinated intersections are fixed.Such a restriction may possibly lead to unsatisfactorylocal solutions Based upon this observation, an extension of their model by relaxing such restrictionsis proposed so that the lengthsof phases in a cycle, as well as the cycle itself, become variable. Thereafter, tworevised models, one by relaxing the phase ratios in the model, and the other by adding the dispersion module to the model, are introduced
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