The Research On Signal Timing Optimization Of Isolated Intersection Based On Multiphase And Variable Phase Sequence

With the development of China’s economy and the acceleration of the process ofurbanization and motorization, traffic congestion in cities of all sizes is growing,environmental pollution and traffic accidents resulting in frequent serious affect the publictransport service levels, and even endanger the lives and property of the people. This makesurban transport issues become complex and intractable social problems. Isolated intersectionsare important nodes constituting cities’ traffic network, and a isolated intersection signaltiming is a key factor in the control of the traffic. It presents a signal timing optimization canbe based on multiphase and variable phase sequence to reduce traffic conflicts and reduceharm to the environment and implications on residents travel security from city vehicles,effectively prevent traffic congestion and improve the intersection vehicle traffic rate.Firstly, based on the intersection signal control theory, determined the control mode andparameters of traffic signals, and defined the relationship the traffic flows and signal groupsof isolated intersection.Secondly, based on the influencing factors and design principles of the design for phaseand phase sequence of intersection, designed the phase and phase sequence for the isolatedintersection. According to the intersection of all crossing traffic flow are whether in balance,the thesis classifies phase designs with lap traffic flow of multi-phase and no lap traffic flowof multi-phase. For the two different traffic models, respectively considered the number ofphases, phase combinations, the initial phase sequence arrangement, the thesis established theoptimization model of phase sequence based on the least loss of time, and using geneticalgorithms to solve the optimization model of phase sequence.Then, when to study the isolated intersection signal timing optimization，based onseveral typical signal timing methods, established a multi-objective optimization model withthe goal of minimum the total delay time and number of stops and maximum the capacity ofthrough,and solved the model by Lagrange multiplier method. Also the thesis proposed amulti-phase disguising signal timing optimization method which the phase sequence canchange, and propose concrete steps of the algorithm.Finally, take the T-intersection at Jinyuan Village Road and Yangzhuang East Street ofShijingshan District in Beijing as an example, through the intersection signal timing modelbased on multiphase and variable phase sequence, it improved the capacity of the intersectionand reduced the total number of delays and parking of vehicles.