面向单向交通路网的绿波协调设计方法

为提高单向交通路网运行效率，本文提出了一种单向交通路网绿波协调控制方法。首先， 分析不同类型的单行环路特征，考虑行人专用相位，建立单行环路中的路段行驶时间与交叉口信 号配时参数之间的约束关系，推导环路偏移绿信比的计算公式，以所有路段平均偏移绿信比最小 作为优化目标，给出最佳公共信号周期优化算法；然后，分析环路偏移绿信比与各路段偏移绿灯 时间的关系，根据约束关系将各个最小环路的偏移绿信比分配到环路上的单向路段，推导绿波带 宽大小计算方法；随后，以单向交通路网平均带宽占比最大为目标优化交叉口绿信比，给出交叉 口相位差计算方法，实现单向交通路网信号协调控制方案的优化求解；最后，以一个3×3的单向交 通路网为例进行案例分析，结果表明：利用本文方法求得的信号配时方案可以获得明显的绿波效 果，能够使所有交叉口的带宽占比均在70%以上，总体绿波效果优于SYNCHRO方案。针对未饱 和状态下的3种不同流量输入条件，利用VISSIM仿真实验，发现与SYNCHRO方案相比，本文提 出方案的路网直行车辆平均延误时间分别降低了9.0%、16.4%、26.1%，平均停车次数分别降低了 31.2%、48.8%、41.6%，路网的服务水平明显提升，有效验证了本文方法的可行性与优越性。

Green Wave Coordinated Design Method for One-way Traffic Network

To improve the operation efficiency of one- way traffic networks, this paper proposed a green wave coordinated control method. Firstly, the characteristics of different one-way traffic loops were analyzed. Considering the pedestrian phase, the constraint between the link traveling time and the signal timing parameters in the one-way traffic loop was established, and the calculation formulas of the bias-split were derived. The common signal cycle optimization algorithm was proposed by minimizing the average bias-split of all roads. Then, the relationship between the bias-split and the bias-time of each road was analyzed, and the bias-split was allocated to each one-way road according to the constraint relationship, and the calculation method of green wave bandwidth was derived. Next, the split of the intersection was optimized with the goal of maximizing the bandwidth percentage. The offset calculation method was proposed, and the signal coordination control scheme of the one-way traffic network was obtained. Finally, taking a 3×3 one-way traffic network as an example, the results show that the signal timing scheme obtained by this method has an obvious green wave effect, and it has the proportion of bandwidth of all intersections more than 70%, which is better than the SYNCHRO scheme. The VISSIM simulation results of the three different flow conditions in the unsaturated state show that compared with the SYNCHRO scheme, the average delays of through vehicles in the traffic network are reduced by 9.0% , 16.4% , and 26.1% respectively, and the average stops of through vehicles arereduced by 31.2%, 48.8%, and 41.6%, respectively. The service level of the traffic network is significantly improved, which shows the feasibility and superiority of this method.