基于sigmoid换道模型的匝道连续分流间距  

Continuous diversion spacing of ramps based on sigmoid lane-change model

作　　者：潘兵宏[1] 章泽龙 周乾 马朝辉 王潮 PAN Bing-hong;ZHANG Ze-long;ZHOU Qian;MA Chao-hui;WANG Chao(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.Ltd.,Changsha 410219,Hunan,China;Poly Changda Egineering Co.Ltd.,Guangzhou 511400,Guangdong,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410219 [3]保利长大工程有限公司,广东广州511400

出　　处：《长安大学学报（自然科学版）》2023年第6期37-48,共12页Journal of Chang’an University(Natural Science Edition)

基　　金：湖南省交通运输厅科技项目(202007)。

摘　　要：为解决现有匝道连续分流间距规定未考虑匝道设计速度及车辆换道紧急程度,导致匝道设计速度较高时相邻出口间距不足车辆紧急换道的问题,开展匝道连续分流间距研究。首先,基于车辆运行特征并考虑换道安全性,将驾驶人在匝道连续分流区的操作过程划分为4个阶段:减速过程、标志认读过程、等待过程和换道过程。其次,基于实测车辆运行轨迹,提出了考虑换道紧急程度的sigmoid换道轨迹模型,并通过拟合优度检验证明了该模型对匝道连续分流区的适用性。最后,分析了间距模型中参数的取值,提出了匝道连续分流最小间距推荐值。结果表明:sigmoid换道模型对于匝道中车辆左换道和右换道的拟合优度分别可达97.83%和96.63%,拟合精度较高,能够准确描述匝道连续分流区的换道行为。提出的间距计算模型符合车辆行驶特点,与轨迹吻合度高;当匝道设计速度在小于60 km/h和大于60 km/h时,匝道连续分流最小间距分别受主线设计速度和匝道设计速度控制,设计速度较高的匝道所需间距明显更长。与《公路路线设计规范》(JTG D20—2017)和《公路立体交叉设计细则》(JTG/T D21—2014)中规定值相比,当匝道设计速度小于60 km/h时,间距推荐值与规定值相近;当匝道设计速度大于60 km/h时,规定值偏小。提出的最小间距推荐值,可为设计人员对该指标的灵活设计提供参考。To solve the problem that the existing ramp continuous diversion spacing regulations do not take into account the design speed of the ramp and the urgency of vehicle lane change,resulting in insufficient spacing between adjacent exits when the design speed of the ramp is high,causing emergency vehicle lane change,continuous diversion spacing of ramp was studied.First,based on the vehicle operation characteristics and considering the safety of lane change,the operation process of drivers in the continuous diversion area of the ramp was divided into four stages,deceleration,sign recognition,waiting and lane-change stage.Second,based on the measured vehicle trajectories,a sigmoid lane change trajectory model considering the urgency of lane change was proposed,and the applicability of the model to the continuous diversion area of the ramp was proved by the fit test.Finally,the values of the parameters in the spacing model were analyzed,and the recommended minimum spacing values for continuous ramp diversion were proposed.The results show that the sigmoid lane change model has a good fit accuracy of 97.83%and 96.63%for the left lane change and right lane change of vehicles in the ramp,respectively,which can accurately describe the lane change behavior in the continuous diversion area of the ramp.The proposed spacing calculation model is consistent with the vehicle driving characteristics and fits well with the trajectory.When the ramp design speed is less than 60 km/h and more than 60 km/h,the minimum spacing of continuous ramp diversion is controlled by the mainline design speed and the ramp design speed,and the spacing required for the ramp with higher design speed is significantly longer.When the design speed of the ramp is less than 60 km/h,the recommended spacing is similar to the specified value of《Specifications for Highway Geometric Design》(JTG D20—2017)and《Guidelines for design of highway grade-separated intersections》(JTG/T D21—2014).When the design speed of the ramp is greater than 60 km/h,the s

关 键 词：道路工程 最小间距 换道行为 匝道连续分流 轨迹模型 

分 类 号：U412.35[交通运输工程—道路与铁道工程]