基于元胞自动机的高速公路施工区交通影响分析

Analysis of traffic influence of freeway work zone based on cellular automata model

以NaSch模型为基础,结合高速公路施工区交通流特性定义其参数和规则,建立了与实际高速公路施工区相仿的交通流模型。在研究单个施工区的基础上,探讨了系统中存在2个施工区的交通流状况和旅行时间的变化规律,以及两封闭路段间距变化对交通流特性的影响,并与其合并作业时的情况进行了对比。数值计算表明:在不同的间距情况下,高速公路系统表现出不同的交通流特性,在较小间距范围内,两施工区之间车辆的频繁换道会引起交织冲突的增加,从而引起车辆分布的不均匀;间距较大时,第2个施工区的增加并不会对系统造成额外的影响。最后,提出了实际高速公路施工区布设的改善建议。

Based on the NaSch model,this study defined the parameters and rules combining with the traffic flow characteristics for work zones,then established the traffic flow model similar to the actual freeway work zone.This paper firstly researched the condition where there was a work zone in the freeway system,studied the traffic flow features and variation rules of travel time in the two-work-zone-system,and further compared the two-lane-closing facility with different spacing with combined facility.Numerical calculation shows that highway system performs differently with different distances.Within the scope of the small spacing,frequent lane changing between the two-work-zone will increase the intertwined conflicts,causing traffic distribution uniform;when the spacing is larger,the added work zone will not induce additional influence on the freeway system.Finally,on the basis of the study results,this design puts forward the improvement for the layout of actual freeway work zone.7figs,11 refs.