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摘要
Bandwidth-based traffic signal coordination plays a crucial role in improving the efficiency of vehicles within urban traffic networks. It is widely adopted in the field of arterial and network traffic signal control. However, traditional bandwidth-based network control methods mostly focus on optimizing coordination variables, such as offsets and phase sequences, after the coordinated paths are determined. This neglects the simultaneous optimization of path selection and coordination variables, resulting in limited coordination effectiveness and challenges in catering to the varied control requirements of different coordination paths. To address these issues, this paper focuses on the concurrent optimization of path selection and bandwidth-based coordination within an unclosed traffic network. The coordination path is taken as a decision variable and optimized concurrently with offsets and phase sequences. The choice sets for coordination paths and coordination path pairs are determined through an analysis of the inflow and outflow relationships of traffic movements between adjacent intersections. The optimization objective is to maximize the sum of weighted bandwidth. To capture the spatial and temporal constraints involving bandwidth, coordinated path pairs, offsets, phase sequences, travel time, and red and green time, a time-space diagram is employed. In addition, binary variables are introduced to formulate optimization constraints for the coordination path pairs. The simultaneous optimization of path selection and bandwidth-based coordination is formulated as a mixed-integer nonlinear programming problem. The results of a numerical example demonstrate that, when compared to the traditional bandwidth- based model that focuses on coordinating through paths, the proposed model automatically selects key coordination paths with higher traffic volumes in the traffic network. Consequently, the sum of weighted bandwidths generated by this model at the network level increases by 14.16%, and the sum of weighted bandwidths on four arterials sees improvements of 17.26%, 20.68%, -0.29%, and 39.19%, respectively. ? 2023 Science Press.
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