城市多级道路交通运行水平一体化评价模型

United Evaluation Model of Traffic Operation Level for Different Types of Urban Road

摘要:

针对城市不同等级道路交通运行水平评价中存在的指标不一、阈值多样问题,将原有服务水平概念从设施供给水平和交通运行水平两个方面进行了重新阐释.在这一概念指导下,选用能够体现不同设施供给水平差异的速度比作为运行水平评价的客观指标,并采用专家评分实验的方法建立了道路交通运行水平评分模型,实现了快速路与地面道路交通运行状况评价的统一.最后采用模糊集的概念建立了不同交通运行状态的隶属度函数,给出了道路交通运行状态的分级阈值.

Abstract:

New concept of road level of service (LOS) is proposed,which defines LOS into two parts:level of facility supply and level of traffic operation.Under the direction of this new concept,the ratio of travel speed to free flow speed (FFS) is selected as the evaluation index of traffic operation.Then,a test of traffic operation evaluation for urban expressway and streets,in which the experts are invited to grade different traffic operation level,is carried out.The result shows that,by introducing the FFS into the evaluation index to consider the difference of facilities,the evaluation methods of operation level for urban expressway and streets can be united.Finally,based on the concept of fuzzy set,the functions of degree of subordination is given for different level of traffic operation with the threshold value for each level following.