Phase Sequencing Model for Signalized Isolated Intersection Based on Lost Time

Abstract:

The problem of phase sequencing with the objective of minimizing lost time was modeled based on mixed traffic characteristics.The matrixes of intergreen time,phase sequence,maximum intergreen time and sum of intergreen time were built and the mathematical relationship between matrixes was modeled based on signal groups including motor traffic signal groups (VG),pedestrian and bicycle signal groups (PG).The phase sequence optimization model was built based on the proposed matrixes and four kinds of objectives were considered:minimum total lost time of VG;lost time of VG;minimum total lost time of VG and PG,maximum lost time of VG and PG.A case study of a signalized four-stage intersection of Zhangjiagang City validated the model.The results show that the lost time of intersection paries with different phase sequences.The PG dramatically affects the optimal phase sequence.The proposed model can output optimal solution of phase sequence based on different objectives with the consideration of mixed traffic characteristics.The intergreen modules under different objectives were analyzed and the signal group-based intergreen design method was proposed to minimize lost time of intersection.