Research On Multi-objective Dynamic Left-forbidden Control In Traffic Jam Area Considering Turn Delay

With the increasingly improvement of urbanization and motorization in our modernized city,the contradiction between the supply and demand of road resources has become increasingly acute,which has also caused congestion during rush houris.Urban intersections are the most important areas for traffic congestion and evacuation.So reconstruction and expansion of intersections from an engineering perspective can improve the capacity of intersections to a certain degree.But the engineering method to relieve congestion is not the simplest and most direct method mainly due to the below two reasons.On the one hand,reconstruction of intersections requests to close roads during construction which has a great impact on the daily traffic.On the other hand,some existing intersections cannot meet the conditions of large-scale reconstruction and expansion.As a traffic management control method,left-forbidden control has the advantages of improving the straight-through capacity,improving the traffic efficiency of intersections,and eliminating the need for additional road engineering operations.Therefore,it is a feasible research direction to consider using left-forbidden control to alleviate traffic congestion.And the choice of the left-forbidden position directly determines the effect of the left-forbidden control,which will also play an important role in relieving traffic jam.So this paper takes the intersection of congested area as the research objects.Then further studies the problem of determining and optimizing the combination of the left-forbidden entryways based on the summary of the domestic and international left-forbidden control cases.The main research direction of this paper is summarized as follows:Firstly,the paper puts forward an innovative idea of controlling regional left-forbidden dynamically for the problem of the congestion direction and congestion period change caused by the directional change of the rush houris traffic of the urban main roads by highlighting its principles and setting principles.At the same time,it introduces the special design of signal phase and road marking for dynamic left-forbidden to improve the operability of dynamic left-forbidden control in the actual traffic road network.Secondly,an improved steering delay calculation method is proposed,and on the basis of fully considering the influence of steering delay in congested areas on left-handed control,a multi-objective left-handed bi-level programming model is constructed.The upper-level planning problem is to optimize the total impedance of the urban regional road network operation and the total amount of motor vehicle exhaust emissions.It is responsible for continuously passing the upper-level left-forbidden decision variables to the lower layer;and the lower-level planning is based on the optimal allocation of users and is responsible for the lower-level road sections.Flow is fed back to the upper layer as a decision variable.Based on the improved representation method of adjacent road segments of steering flow,the constraints of the lower-level programming model are optimized.Then,based on the improved user equilibrium distribution algorithm,heuristic genetic algorithm is used to solve the design of the left-forbidden bi-level programming model,and the specific solution steps of each algorithm are given in detail.The effectiveness of the algorithm is verified by analyzing the results of Matlab design of the virtual road network.Finally,in order to verify the reliability of the model and algorithm in the real road network,the road network topology in the congested area of Suzhou Industrial Park was used as the simulation object to establish the road network topology structure.Then TransCAD and Vissim simulation platform are used to realize the simulation of solving the results of multi-objective left-forbidden bi-level programming model.By comparing and analyzing the changes of the evaluation indicators before and after the ban on the left,it is further verified that by setting up a proper combination of the left on the congested area,the effect of reducing congestion and improving the efficiency of the regional road network can be achieved.