定向车道终点至城市干道分流点的最小净距

Minimum clear distance from ending point of directional lane to diversion point of urban arterial road

为了充分发挥定向车道的服务功能,避免定向车道终点与城市干道分流点之间因净距不足而引发各种交通问题,需确定满足其需求的最小长度。在介绍定向车道的基础上,基于驾驶员最不利行车状况明确了最小净距的定义,并探究了净距的组成部分;然后从实际调查情况出发,分析定向车道终点的布设位置、车辆的换道类型及其换道次数对净距的影响;随后考虑驾驶员的行车特性,从标志视认、判断决策、车辆换道和安全确认4个阶段建立了最小净距计算模型,并给出了最小净距建议值;最后利用VISSIM仿真软件对模型与建议值的合理性与可行性进行了验证。结果表明:当且仅当最小净距大于等于建议值时,道路安全水平达到安全;干道设计速度的增大和干道车道数的增加都会造成定向车道终点至干道分流点的最小净距增大。

In order to give full play to the service function of directional lane and avoid various traffic problems caused by insufficient clear distance between the end of directional lane and the diversion point of urban trunk road,it is necessary to determine the minimum length to meet the demand.Based on the introduction of directional lane,the definition of minimum clear distance was defined based on the most unfavorable driving conditions of drivers,and the components of clear distance were explored.Based on the actual investigation,the layout position of directional lane end point,lane change type of vehicles and the number of lane changing times on the clear distance were analyzed.Then,considering the driving characteristics of drivers,the decision-making was judged from the sign recognition.Finally,the rationality and feasibility of the model and the recommended value were verified by VISSIM simulation software.The results show that only when the minimum clear distance is greater than or equal to the recommended value,the road safety level reaches safety.The increase of design speed and the number of trunk roads will cause the minimum clear distance from the end of directional lane to the diversion point of trunk road.