Abstract: In order to determine the main streamline of intersection group and better coordinate the control of intersection group， an algorithm for identifying the main streamline of intersection group based on coordination influence flow is established. Firstly， the flow components affected by route coordination are analyzed. Through the statistical analysis of the trajectory of floating vehicles within the intersection group， the alternative main streamline is determined and the number of floating vehicles affected by streamline coordination is calculated；Then， the coordinated impact flow of the alternative main streamline is estimated by using the intersection flow and steering ratio； Finally， according to of the number of floating vehicles affected by the statistics of coordination of the alternative main streamline and the estimated coordination impact flow，we calculate the streamline weight index， and determine the main streamline of the intersection group through the weight index. Taking an intersection group divided by Yanta District of Xi’an as an example， the main streamline of the intersection group is identified for verifying the effect of the algorithm. The experimental results show that the algorithm can use the floating vehicle data and flow data to identify the main streamline of the intersection group in real time， and provide support for the signal coordination control of the intersection group.

Key words: intersection group, main streamline, coordinated impact flow, floating vehicle trajectory data