Control Strategy of Variable Speed Limits for Improving Traffic Efficiency at Merge Bottleneck on Freeway
Control Strategy of Variable Speed Limits for Improving Traffic Efficiency at Merge Bottleneck on Freeway
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DOI：
10.1016/j.sbspro.2013.08.227
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Hang Zhang;Zhibin Li;Pan Liu;Chengcheng Xu;Hao Yu
中科院分区：
文献类型：
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作者：
Hang Zhang;Zhibin Li;Pan Liu;Chengcheng Xu;Hao Yu
如果主线和入口匝道的交通需求超过瓶颈通行能力，则在高速公路的汇流瓶颈区域形成排队。然后瓶颈流量进一步下降到瓶颈通过能力以下，称为能力下降现象。本研究旨在开发可变限速(VSL)控制策略，以期通过防止通行能力下降来提高高速公路并轨瓶颈区域的通行效率。建立了小区传输模型(CTM)，并用现场交通数据进行了校准，以评估VSL的有效性。结果表明，通过降低上游VSL的限速，可以防止汇流瓶颈处的能力下降，并使泄流流量保持在瓶颈能力附近。本研究提出的VSL控制策略使出行延误减少了56.10%，有效地提高了汇流瓶颈区域的通行效率。
Queue forms at merge bottleneck area on freeways if the mainline and on-ramp traffic demand exceeds the capacity of bottleneck. Then bottleneck discharge flow further drops below the capacity of bottleneck which is termed as the capacity drop phenomenon. This study aims to develop control strategies of Variable Speed Limits (VSL) for improving traffic efficiency at freeway merge bottleneck area via preventing the capacity drop. The Cell Transmission Model (CTM) was developed and calibrated with field traffic data to evaluate the effectiveness of VSL. The results showed that by reducing the speed limit in VSL at upstream area, the capacity drop at the merge bottleneck was prevented and the discharge flow rate was kept near the bottleneck capacity. The control strategy of VSL developed in this study significantly reduced the travel delay by 56.10% and was effective in improving the traffic efficiency at the merge bottleneck area.