论文部分内容阅读
通过对现有净距计算方法的讨论,提出了隧道出口与主线分流点最小净距的定义,并探究净距的组成部分。通过分析主线分流的构造形式、车道数对净距的影响,并基于明适应、标志视认、驾驶人的判断、换道和确认距离对净距的影响,根据换道模型建立了最不利情况下隧道出口与主线分流点的最小净距计算模型,提出了推荐值,并利用VISSIM对模型的合理性进行验证。研究结果表明:随着设计速度和车道数的增加,隧道出口与主线分流点的最小净距均增大;设置大型车专用匝道对于减小隧道出口与主线分流点的最小净距作用不明显。
Through the discussion of the existing method for calculating the clear distance, the definition of the minimum clear distance between the tunnel exit and the main stream diversion point is proposed, and the components of clear distance are explored. By analyzing the structure of the mainline diversion and the influence of the number of lanes on the clear distance, the most unfavorable situation was established based on the lane change model, based on the effect of bright adaptation, sign recognition, driver’s judgment, lane change and confirmation of distance. The minimum clearance distance between the tunnel exit and mainline diversion point is calculated, the recommended value is proposed, and the rationality of the model is validated by VISSIM. The results show that with the increase of design speed and the number of lanes, the minimum clearance between tunnel exit and main line diversion point increases. The setting of special ramp for large vehicles has no obvious effect on reducing the minimum clearance between tunnel exit and mainline diversion point.