混行自行车道超车干扰与车道设计

摘要

In this paper,we analyze bicycles' maneuvers in 113 moped-passing-bicycle events collected from shared bicycle path in Shanghai.By analyzing trajectories of both overtaking mopeds and overtaken bicycles,we propose an indicator of overtaking interference for mopeds.This indicator describes the speed difference as well as the overtaking distance,between the moped and the bicycle.The results show that when the indicator of overtaking interference exceeds a critical value,the overtaken bicycle's acceleration volatility at lateral direction will significantly decrease.However,the overtaken interference has its marginal utility,which means when the overtaken interference continually increases,the decrease rate for the lateral acceleration volatility of overtaken bicycles will decrease.The K-means + + model is used to classify the overtaking interference and the further results show that when bicycle lane width is between 1.1 m and 1.3 m,meanwhile a 25 km · h-1 posted speed for mopeds is taken,the severe overtaking interference could be limited.%基于上海市非机动车道113起助动车超越自行车事件,通过分析超车助动车和被超自行车行驶轨迹,提出了助动车超车干扰强度指标.超车干扰强度指标同时考虑了助动车和自行车速度的差异,以及超车时两车间距的特征.研究发现,当助动车超车干扰强度大于临界值时,被超自行车侧向加速度波动率明显降低.然而,超车干扰存在边际效应,即随着超车干扰的持续增大,自行车侧向加速度波动的减少幅度却在降低.利用K-means++算法对超车干扰强度进行了分级,认为自行车道单车道宽度在1.1m到1.3m之间,且同时对助动车实施25 km·h-1的限速,能有效减小超车干扰的严重程度.