| With the enhancement of China’s economic strength and comprehensive national strength,large-scale events such as the Olympic Games and Expos have been held in China one after another.The increase of traffic demand and traffic direction coefficient during large-scale events have brought great pressure on the road traffic operation around the event venues and the event route,and also had a negative impact on the daily travel of residents.Therefore,reasonable transportation organization is the key to the smooth holding of large-scale events.This paper takes the large-scale event as the background,based on the urban road traffic,deeply analyzes the traffic operation characteristics during the large-scale event,and studies the green wave coordination control method of the arterial line with priority for the event fleet.The main research contents are as follows:Firstly,on the basis of analyzing the traffic demand,traffic flow and fleet driving characteristics of large-scale events,the arterial coordination control method is explored.By comparing the common methods in the green wave control model,the AM-BAND(Asymmetrical Multi-BAND)model is selected as the basic model of this paper.Considering the shortest green light time for the active fleet to pass through the intersection,the minimum green wave bandwidth constraint of the driving direction of the fleet is added.At the same time,with the maximum two-way green wave bandwidth and the minimum travel time of the road section as the optimization goals,a multi-objective green wave coordinated control optimization model for trunk lines is established.According to the traffic characteristics of large-scale events,and based on the improved AM-BAND model,the coordinated control process of green waves on trunk lines under large-scale events is proposed.Then,Zhongguancun Street and Zhongguancun South Street were selected as the research areas,and the traffic flow at the intersection,signal timing,road speed and road infrastructure were investigated,and the green wave coordination control conditions of the trunk line were used to judge that they met the coordination requirements.For the active vehicle driving route,based on the survey data,the MULTIBAND model,the AM-BAND model and the improved AM-BAND model are used to optimize the green wave coordinated control of the trunk line,and the green wave band width and road section travel time under different control schemes are analyzed.The results show that the improved AM-band model can increase the green wave time in the moving direction of the trunk line,so that the team can continuously pass through the coordinated intersection of the trunk line,and consider the minimization of driving time in the objective function,which can effectively improve the green wave speed and increase the traffic efficiency of vehicles in the green wave band.Finally,the traffic simulation software Paramics is used to simulate and analyze the green wave coordinated control optimization scheme of trunk lines under large-scale events.According to the different traffic demand characteristics of large-scale events,the road network operation of the current intersection signal timing scheme 、 signal timing schemes obtained by the MULTIBAND model,the AM-BAND model and the improved AM-BAND model under different flow changes is analyzed respectively.The simulation results show that the improved AM-BAND model can effectively reduce the average delay and the average number of stops at intersections in the direction of movement of the active fleet under different flow changes,and also improve the overall operating efficiency of the trunk line,which further proves the effectiveness of the model proposed in this paper. |
