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为了解决高速公路主线合流区交通拥挤与入口匝道排队溢出问题,提出了一种入口匝道协调控制方法,依据主线合流区交通状态和入口匝道排队长度设计需要协调控制的匝道个数,以扩大协调匝道组的空间容量,增大截留进入主线交通拥挤区域车辆的能力;应用实时检测的主线合流区通过量和占有率估计主线动态临界占有率,采用入口匝道调节率自动跟踪主线合流区动态临界占有率的变化,以提高主线通过量;采用匝道相对排队长度设计启发式规则,以提高入口匝道协调控制能力,防止排队溢出;以沪宁高速公路G42为仿真背景,应用VISSIM仿真软件,从路网性能、主线合流区交通状态和匝道排队长度三方面对提出方法的控制效果进行评价。计算结果表明:相比于无控制算法,采用控制方法的总行程时间减少约8.44%,路网平均延误减少约62.97%;采用ALINEA算法的总行程时间减少约2.85%,路网平均延误减少约21.20%;采用Linked-control算法的总行程时间减少约6.00%,路网平均延误减少约56.17%;采用控制方法的主线合流区的交通通过量在交通状态突变时增加了540veh·h-1,且各个匝道之间排队长度更加均衡。可见,提出方法控制效果优良。
In order to solve the problem of traffic congestion at the main convergence zone of the expressway and the overflow of the inbound ramp, a method of coordinated control of the inbound ramp is proposed. Based on the traffic conditions of the main convergence zone and the inbound ramp, the number of the ramp that needs coordinated control is designed to expand the coordination ramp Group space capacity to increase the ability to intercept vehicles entering the main traffic congestion area; the dynamic critical share of the main line is estimated by the throughput and occupancy of the main-line confluence area detected in real time, and the dynamic critical occupancy of the main-line confluence area is tracked by the entrance ramp adjustment rate To improve the throughput of the main line; the heuristic rule was designed based on the relative queue length of ramps to improve the on-ramp coordination control ability and prevent the queuing overflow; Based on the G42 Shanghai-Nanjing Expressway as the simulation background, the VISSIM simulation software was used to analyze the road network performance , The traffic condition of the main convergence zone and the length of the queue on the ramp, the paper evaluates the control effect of the proposed method. The calculation results show that the total travel time of the control method is reduced by about 8.44% and the average delay of the road network is reduced by about 62.97% compared with that of the non-control algorithm. The total travel time of ALINEA algorithm is reduced by 2.85%, and the average delay of the road network is reduced by about 21.20%. The total travel time of the Linked-control algorithm is reduced by 6.00% and the average delay of the road network is reduced by 56.17%. The traffic volume of the main convergence zone with control method is increased by 540veh · h-1 when the traffic condition is suddenly changed, And the queue length between each ramp more balanced. Can be seen that the proposed method of control is excellent.