Study on the estimation of scatter range of traffic congestion of signal intersection under snow and ice condition

In order to estimate the scatter range of traffic congestion under snow and ice condition, this paper firstly studied how different extent snow and ice conditions influence saturation flow rate, by processing and analyzing collected data, it obtained the reduction values under different extent of snow and ice conditions as well as the corresponding regression function. Then the state of intersection is divided into supersaturated, under-saturated and critical-saturated based on the characteristics of vehicle queuing at signal intersections, it established the real-time calculation model of vehicle queue length.Finally this paper put forward the method of estimating the scatter range of traffic congestion under snow and ice condition on the basis of the interrelation and interaction of various elements of the road network. This method can be used to provide the basis of signal timing optimization, also meaningful for developing rational and effective strategies of traffic control.