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为预防路网局部过度拥堵导致路网大面积过饱和,分析了路段和路网的过饱和交通状态,提出路网过饱和状态判定及过饱和诱导控制策略启动时机的判定方法;基于有向图论,在固定交通需求条件下,以路段饱和度最大值最小化为目标,路段通行能力和路段流量平衡为主要约束条件,建立了交通诱导模型;以路段饱和度方差最小化为目标,路段通行能力和相位时长调整的极限值为约束条件,建立了交通控制模型;采用遗传算法进行求解。算例路网的试验对比表明,交通诱导使路网过饱和路段的最大饱和度有所降低,降低了19.6%;交通控制模型使各路段的饱和度均衡,标准差也有一定程度的降低,降低了12.9%;表明在交通诱导和控制协同管理下,路网运行指标有所改善,在一定程度上预能防路网过饱和状态发生。
In order to prevent over-congestion in the road network, a large area of road network is oversaturated, and the supersaturated traffic status of road sections and road networks is analyzed. The method of judging the supersaturated status of road network and the starting timing of supersaturation-induced control strategy is proposed. On the condition of fixed traffic demand, taking the maximum of road section saturation as the goal, the road traffic capacity and road traffic flow balance as the main constraints, the traffic guidance model is established. With the aim of minimizing the variance of road section saturation, The limits of capability and phase duration are constrained, and a traffic control model is established. The genetic algorithm is used to solve the constraint. The experimental comparison of the example road network shows that the maximum saturation of the saturated road network is reduced by traffic inducement, decreasing by 19.6%. The traffic control model makes the saturation of each road section balanced and the standard deviation reduced to a certain degree, 12.9%. It shows that under the co-management of traffic guidance and control, the operation index of the road network has been improved, to a certain extent, the over-saturation status of the anti-road network can be predicted.