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

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