According to function description of collector road in"Code for Design of Urban Road Engineering"(CJJ37—2012),"traffic flow of branch road is collected into arterial road through the collector road"and"traffic flow from arterial road is dispersed into branch road through the collector road"are taken as study objects. Definition of collecting and distributing functional reliability of urban collector roads is put forward. As the quantitative evaluation index of collector road function realization, its corresponding mathematical model is established. Then, two collector roads in Zhengzhou city are taken as numerical examples. Based on traffic delay data, signal timing and traffic volume, irrelevance of"two different intersections'left-turn delays"is testified. Furthermore, reliability values of"collecting function"and"distributing function"are respectively calculated. Through comparing with the actual traffic operating status, feasibility and applicability of the proposed method are proved.%依据《城市道路工程设计规范》(CJJ37—2012)关于次干路功能的阐述,以"支路车流经过次干路汇集向主干路"和"主干路车流经过次干路分散到支路"为研究对象,提出城市次干路集散功能可靠度的概念,作为定量评价次干路功能实现程度的概率测度指标,进而建立相应的数学模型.基于郑州市区2条次干路,采用实地调查的延误、信号配时和交通量数据资料,论证了非饱和情况下,车流由主干路向次干路和由次干路向支路分散,或由支路向次干路和由次干路向主路汇集的相邻交叉口左转延误的不相关性;结合模型分别计算得到各自的集功能可靠度值、散功能可靠度值,与实际交通运行状态进行对比分析,验证了所提方法的可行性与适用性.
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