城市道路机非冲突分析与自行车道宽度计算方法

为了给自行车道设计提供参考依据,通过开展城市道路路侧自行车与机动车冲突调查,分析给出了路侧自行车数量对机非冲突的影响规律,采用回归分析方法分别构建了主、次干路及支路单车道路侧自行车数量与机非冲突次数的关系模型.基于机非冲突与事故数量的关系,分别以周和月均事故一次作为阈值,将机非冲突划分为轻微冲突、一般冲突与严重冲突.基于所建理论模型,结合机非冲突等级划分,给出城市道路自行车道宽度计算方法,并进行实例分析.研究结果表明:随着单车道路侧自行车数量的增加,自行车与邻近车道机动车的冲突次数随之增长,主干路、支路满足二次函数关系,次干路满足幂函数关系;建议在机非冲突次数达到严重等级时拓宽自行车道,以增加自行车道数量,降低单车道自行车数量,从而减少机非冲突次数,保障自行车行车安全.

Analysis on automobile-bicycle conflict and calculation method for the width of bicycle lane on urban road

In order to provide reference for bicycle lane design, conflict between roadside bicycle and automobile was observed on urban road. The influences of the number of roadside bicycle per lane on conflict were analyzed. The models between them were established respectively for arterial road, sub arterial road, and branch road by regression method. One accident per week and month were selected as threshold values and conflict between automobile and bicycle was divided to slight conflict, general conflict, and serious conflict according to the relation between the number of conflict and accident. Based on established models, calculation method of bicycle lane width was given according to conflict grade division, and case study was conducted. It shows that the number of conflict between automobile and bicycle increased with the raise of the number of roadside bicycle and there were quadratic function relations between them for arterial road and branch road and power function relation between them for sub-arterial road. When conflict grade reached serious degree, it was necessary to widen bicycle lane and increase the number of bicycle lane so as to decrease the number of bicycle per lane and conflict between automobile and bicycle and improve safety level of bicycle.