| Due to the continuous growth of urban residents’ travel demand,the demand for directional coordinated control of road traffic is increasingly obvious.In order to realize the refinement of urban traffic signal control,the selection of coordination objects should not stay at the sub-area level,but needs to be further refined to the connection of the directed path.In this regard,this paper uses the vehicle trajectory data as the data support,takes the coordinated path set as the research object,and carries out relevant scientific research from the selection of the coordinated object,the establishment of the coordination model and the evaluation of the control scheme,focusing on the composition and optimization method of the regional coordinated path set,the signal control model for the road network coordinated path set,the evaluation method of coordination path set control effect,etc..The main scientific research work and the research results obtained are summarized as follows:1)Considering the directional coordinated control requirements between intersections in the control area,by defining the coordinated path,the coordinated path chain and the coordinated path set,as well as the parent path and the sub path that constitute the path chain,a set of conceptual system was established which can reflect the directional requirements of coordination control,and the counting method of coordination path chain was analyzed.The method of generating path chain using trajectory data and license plate recognition data was given respectively.The VISSIM simulation platform was built to provide data support and method validation for subsequent research work.2)According to the trajectory distribution of vehicles in the road network,from the perspective of the number of intersections(the length of the path chain)and the traffic flow carried by the path chain,the corresponding optimization rules and processes of coordinated path set are formulated respectively.The analysis results of the example show that the method can select the main path chain with the larger flow in the control area according to the number of intersections to be coordinated and the flow of the driving path,which can further enrich the division theory of control subareas and intersection groups.3)Considering the demand of directional coordinated control between intersections in the control area,the coordinated path set ws taken as the coordinated object,and the signal control model was established based on the Ring-and-Barrier phase structure,and the comprehensive optimization of signal period,to realize the further optimization of the coordinated path set and the comprehensive optimization of the signal cycle,phase sequence,phase time and phase offset.In order to maximize the total flow of the coordinated path,the optimal signal control scheme was solved by constraining the coordinated phase center point of each intersection.The calculation results of the case show that this model can greatly ensure the optimization effect of the coordinated path set and meet the asymmetric demand of the coordinated control demand in the road network.4)Considering the relationship between the traffic condition of the network and roads,an evaluation method of network traffic condition based on road weight coefficient was proposed.By defining the weight coefficient,the weight of the road traffic condition in the whole network is quantified,and the relationship among the traffic congestion indexs of road section,coordinated path chain,coordinated path set and road network was established.The example shows that the method can judge the traffic condition of the current coordinated path set more scientifically and reasonably,and provides a new evaluation method for the control effect of the coordinated path set. |
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