Abstract:

In order to improve the operation efficiency of urban expressway, avoid congestion at the entrance ramp of expressway which will deteriorate the traffic condition, this paper proposes a collaborative control model which can accurate push vehicles for expressway based on real-time discrimination of expressway traffic state, ramp regulation rate and intersection signal timing scheme. The four sub-models of the coordinated control are the flow precision push model, the critical phase late-closed at the intersection, the early break-time optimization model, and the ramp-line alignment control model. The case study shows that under the coordinated control signal delay strategy, traffic flow and vehicle delay at the ramp, the average queue length and vehicle delay at the intersection are optimized by 2.3%, 40.4%, 21.8% and 22.4%, respectively. Under the coordinated control signal early break strategy, the average vehicle delay and the average queue length of ramp metering are decreased by 22.6%, 31.7%, respectively. The average vehicle delay and the average length of queue at intersections are dropped 9.7% and 4.5%, respectively. The coordination control greatly improves the efficiency of the research area.

Key words: traffic engineering, traffic control, coordination control model, traffic simulation;K-C-Means clustering

摘要：

为提高城市快速路的运行效率，避免快速路入口匝道处发生拥堵并影响地面交通，结合快速路交通状态的实时判别、匝道调节率及交叉口信号配时方案，提出了针对快速路典型交通状态下的精准协同控制模型。协调控制模型的四个子模型为，流量精准推送模型、交叉口关键相位迟闭、早断配时优化模型、匝道排队调节控制模型。案例仿真表明：协调控制信号迟闭策略下匝道通过流量、车均延误，交叉口平均排队长度、车均延误分别优化了2.3%、40.4%、21.8%、22.4%；协调控制信号早断策略下匝道车均延误、平均排队长度，交叉口平均排队长度、车均延误分别优化了22.6%、31.7%、9.7%、4.5%；协调控制较大程度上提升了研究区域运行效率。

关键词: 交通工程, 交通控制, 协调控制模型, 交通仿真, K-C-Means聚类