提高交叉口通行能力的特殊宽度车道设计方法

为了提高交叉口空间资源的利用效率,基于车道组合使用的思想,提出了一种由两条窄车道构成的特殊宽度进口车道设计方法.基于小型车在两条窄车道上并列行驶的概率分布,建立了通行能力计算模型,并运用VISSIM仿真对模型精度进行了检验.通过一系列算例,对比了特殊宽度车道与传统车道的交通运行效益.研究表明,特殊宽度车道可提高车道的通行能力,提升量与大车率和只允许在两条窄车道中某条车道内通行流向的交通量比例负相关,与在两条窄车道均允许通行流向的交通量比例正相关,最高可达75%,且一般当大车率在30%以下时,可达到提升车道通行能力10%的目标.

Increasing the Capacity of Intersections with Special Width Approach Lanes

In order to utilize the spatial resources of the signalized intersections efficiently,based on the concept of integrated use of vehicular lanes,a design model was proposed using a special width approach lane which is combined by two narrow lanes.A capacity calculation model was established based on the probability distribution analysis of passenger cars traveling alongside each other.The precision of the model was tested by VISSIM simulation.Extensive numerical analyses were conducted to evaluate the performance of the proposed design and the results were compared with those of the conventional vehicular lane design.The results show that the special width lane design could increase the capacity of a vehicular lane.The improvement is negatively correlated with the heavy vehicles percentage and the proportion of the vehicles only permitted to drive on one lane of the narrow lane pair,and is positively correlated with the proportion of the vehicles permitted to drive on both lanes of the narrow lane pair.The greatest improvement achieves by as much as 75% in our examples.Moreover,in general,an optimization objective of 10% capacity enhancement could be achieved when the heavy vehicles percentage is lower than 30%.