道路交叉口通行效率与冲突强度关系模型研究

Study on Relation between Traffic Efficiency and Conflict Intensity of Urban Intersections

为了综合反映城市道路交叉口时空资源利用状况,以物理学外力做功原理为基础,分别建立了单股交通流和整个交叉口的通行效率模型。通过模型变换,将其中一个参数定义为冲突强度,从交通流、冲突点及整个交叉口3个层面分别建立了冲突强度模型。最后通过南京交叉口的具体实例得到冲突强度以及对应的通行效率的散点分布图,运用曲线拟合方法建立了交叉口的通行效率与冲突强度的回归模型,结果表明二者之间的关系可用二次函数加以表达。

In order to illustrate the utilization of spatio-temporal resources of intersections comprehensively,the traffic efficiency models of single traffic flow and whole intersection were developed based on the outer force work theory in physics.A parameter in traffic efficiency model was defined as conflict intensity by model transformation,and the conflict intensity models were established on traffic flow,conflict point and intersection levels respectively.Finally,the scattergram of relation between conflict intensity and corresponding traffic efficiency was obtained by specific examples of Nanjing,and the regression model between conflict intensity and traffic efficiency was developed by curve fitting.The result indicates that the relation between them can be expressed with quadratic function.