针对高流量条件下高速公路主线瓶颈路段交通流运行态势恶劣导致通行效率降低的问题，从高速公路瓶颈路段交通流时空特性出发，对元胞传输模型进行扩展，使其能够对瓶颈路段和可变限速条件下交通流运行情况进行描述；在此基础上，构建可变限速控制模型，并采用阶梯限速控制方法对主线交通流进行控制，防止限速路段车辆排队上溯影响上游匝道车辆的正常通行．算例仿真结果表明：本文提出的瓶颈区域可变限速阶梯控制方法能够有效缩短车辆行程时间，在可变限速条件下，与无控制和仅单路段主线控制相比，车均延误分别减少了13．78％和1．60％．%The traffic flow operation at bottleneck sections on freeway mainlines is usually deteriorated by heavy traffic load,resulting in an increase in travel time and a decrease in traffic efficiency. By analyzing the space-time characteristics of the traffic flow at bottleneck sections on freeway mainlines, the cell transmission model was expanded to describe the traffic flow in the bottleneck area under variable speed limit (VSL)control. On this basis,a VSL control model for bottleneck region was established,and stair-like strategies were proposed to prevent the long queue from interrupting the vehicles operation at upstream on- and off-ramps. The proposed methods were tested through a case study,and the results demonstrate that the proposed stair-like strategies for VSLs can effectively reduce the travel time and decrease the average delay. Compared with no control and the strategy of using mainline control on single sections,the proposed strategies can reduce the average delay by about 13. 78% and 1. 60%,respectively.
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