A Multi-Hierarchical Strategy for On-Ramp Coordination

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• 作者：Rui Jiang ; Jinwoo (Brian) Lee ; Edward Chung
• 关键词：Ramp metering ; Ramp coordination ; Micro ; simulation
• 刊名：International Journal of Intelligent Transportation Systems Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：15
• 期：1
• 页码：50-62
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Electrical Engineering; Automotive Engineering; Robotics and Automation; Computer Imaging, Vision, Pattern Recognition and Graphics; Civil Engineering; User Interfaces and Human Computer Interaction;
• 出版者：Springer US
• ISSN：1868-8659
• 卷排序：15

文摘

Ramp metering (RM) is an access control for motorways, in which a traffic signal is placed at on-ramps to regulate the rate of vehicles entering the motorway and thus to preserve the motorway capacity. In general, RM algorithms fall into two categories by their effective scope: local control and coordinated control. Local control algorithm determines the metering rate based on the traffic condition on adjacent motorway mainline and the on-ramp. Conversely, coordinated RM strategies make use of measurements from the entire motorway network to operate individual ramp signals for optimal performance at the network level. This study proposes a multi-hierarchical strategy for on-ramp coordination. The strategy is structured in two layers. At the higher layer, a centralised, predictive controller plans the coordination control within a long update interval based on the location of high-risk breakdown flow. At the lower layer, reactive controllers determine the metering rates of those ramps involved in the ramp coordination with a short update interval. This strategy is modelled and applied to the northbound model of the Pacific Motorway in a micro-simulation platform (AIMSUN). The simulation results show that the proposed strategy effectively delays the onset of congestion and reduces total congestion with better managed on-ramp queues.