Merging Model of Vehicles on Upstream Transition Area of Expressway Work Zones
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摘要: 为确定高速公路施工区上游过渡区长度对高速公路主车道交通流的影响,首先应用实测数据分析施工区上游过渡区主车道的车头时距分布特性,结果表明车头时距分布符合爱尔朗分布;其次在考虑车辆汇入过程中临界间隙变化情况的基础上,利用间隙接受理论和微分法建立了车辆汇入模型,用以计算高速公路上游过渡区的长度;最后通过算例揭示了上游过渡区长度、主车道交通量和汇入速度对车辆汇入概率的影响规律.研究结果表明:车辆汇入模型能较好地反映不同公路几何要素和交通条件情况下行驶车辆的汇入行为,为施工区设计提供一种新方法.Abstract: To explore the influence of upstream transition length on expressway main lane traffic volume, the headway characteristics in main lanes of upstream transition area were analyzed based on actual data, showing the headway distribution in accord with Erlang distribution. Considering the vehicles' changeable critical headway when driving along upstream transition area, a vehicle merging model was proposed by gap acceptance theory and differential methods, thus a new optimal design method of the upstream transition length was presented. This method reveales the effect of upstream transition length, traffic flow of main lane and merging speed on merging probability. Results show that the merging model can well consider the effect of expressway geometry characteristic and traffic conditions on driver's merging behavior. The upstream transition length provides a new method for the design of work zones.
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Keywords:
- work zones /
- upstream transition area /
- merging lane /
- merging model
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