Optimisation model for network progression coordinated control under the signal design mode of split phasing

Abstract

An optimisation model for network progression coordinated control under the signal design mode of split phasing in unsaturated traffic conditions was proposed in this study. Considering the characteristics of the cyclical variation relationship between the bidirectional progression coordinated control effect and intersection spacing, a cosine function of the time difference between the actual green centre point and the ideal green centre point was defined as the evaluation index. The constraints of the common signal cycle, phase time, and phase sequence were introduced in the model, and the phase time allocation was discussed in this study. The model enables the phase time and phase sequence of each intersection to be freely valued within the solution space, and realises the comprehensive optimisation of the phase time, as well as common signal cycle, phase sequence, and offset. The case study demonstrates that the scheme optimised by this model can provide significant progression coordinated control effects for all the through movements on each artery. This method is effective when applied to network progression coordinated control.