With accelerating urbanization, traffic congestion has become a major challenge for urban mobility. Accurate identification of network bottlenecks is vital for congestion mitigation and traffic optimization. However, existing approaches relying on static topological indicators and preset thresholds often produce unstable and less reliable results. To address these limitations, a data-driven framework for bottleneck identification based on CP-CCM (congestion propagation-convergent cross mapping) model was proposed. The nonlinear causal dependencies between adjacent road segments was quantified and a congestion propagation graph was constructed. An improved breadth-first search algorithm was used to derive propagation trees and calculate each segment’s total congestion cost by integrating self-congestion and propagation effects. Segments were then ranked by congestion level to identify critical bottlenecks. SUMO simulation results showed that expanding top-level bottleneck segments increased average travel speed by 6.0% and reduced average waiting time by 25.6%, validating the accuracy and practical effectiveness of the proposed framework.
由于难以在实际路网中直接验证瓶颈路段识别方法的有效性,基于SUMO平台进行仿真实验。选取2024年10月25日(周五)早高峰时段(07:15—09:15)的个体车辆轨迹数据作为输入数据,构建仿真路网,如图13所示。为保证仿真环境与实际交通运行特征相符,正式仿真时段设定为07:30—08:30,并设置 15 min 预热阶段(07:15—07:30),以确保系统进入稳态运行。
然而,CP-CCM 方法在强单向因果关系情形下可能存在双向传播误判;此外,拥堵传播图的动态更新需结合 OD 分布特征。鉴于城市交通瓶颈具有明显的时空异质性(如工作日与周末、早晚高峰间特征差异显著),未来研究可引入多尺度传播模型,结合实时交通监测数据实现动态瓶颈识别与预测,深入探讨交通波动的传播机制,为智能交通系统提供更加精细化的管控与决策支持。
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