Research On Traffic Sub-area Divisions In Arterial Coordination Control System

Intersections are important nodes in the road network, which size of the capacity determines traffic efficiency of the road network. Signal control program run significant impact on traffic at the intersection. Arterial coordination control can effectively improve the capacity of the intersection, reduce average delay and stop time. But excessive number of intersection in a arterial coordination system, causing the coordination effect is reduced, for traffic control sub-zoning Technology is proposed. This paper studies the problem of traffic control sub-region is divided on excessive number of signalized intersections in trunk coordinated control system, establish a divided principle which based on the benefits interval similarity of coordination.Firstly, the paper analyzes determinations of the trunk coordination and control technology as well as the traffic control sub-region division technology research including trunk coordination optimization control parameters, the main object of coordination and other objects, and analyze their shortcomings. The analysis about the target of the coordination, traffic characteristics of trunk coordinate system in existing research is not enough, In particular, the uncertainty of traffic reached, traffic speeds in the coordination system, and dividing traffic control sub-region rely on human subjectivity seriously;Belt speed fluctuation, traffic fluctuations of coordinated system on traffic control sub-region which did not take seriously, then the stability of the divided traffic control sub-region is poor; traffic characteristics of coordination system and the effect of the control system including many coordination sub-regions considers uniform, resulting coordinator partition after control extracted simulation results and actual coordination is different.For lack of existing research, firstly, the paper analyzes traffic pulled out from the intersection,the road speed, the discrete nature of the team, traffic arrival rate in coordinated control system reflecting characteristics, and establish traffic control sub-zoning principle about coordination benefit Intervals similarity on traffic and traffic speed, while optimize its basic control parameters: system common period, effective green time of coordination phase, green ratio; Secondly, taking advantage of traffic randomness proves accessibility issue of coordinating traffic control system, and recommend that there are 3-5 signalized intersections in a traffic control sub-region, enhancing the effect of the divided control, and analyze fluctuation of simultaneous speed, traffic arrival rate in coordinate system effect on the coordination and control, Conversely find out the sub-zone speed range and traffic volatility reached range, improving the stability of traffic control sub-region; Then analyze characteristics of traffic in subintervals in order to research Control Strategy of subintervals, determining the time span on the effect of coordinated control system. Finally, select an instance, extract evaluation parameters corresponding time span with VISSIM simulation software, Comparison of the effect of the coordinated control of the main line in the district before divided,proving trunk coordinated control effect after partition is better than the effect of coordination and control before partition, the rationality and validity of the method is presented in this paper.