To improve the efficiency and safety of lane-changing merging of connected autonomous Vehicles, the game interaction process of vehicle lane-changing behavior is portrayed. The German ExiD high-precision trajectory dataset is used to deeply analyze the dynamic interactive game characteristics of vehicle lane changing and merging, and the lane-changing cut-out behavior of mainline vehicles in trajectory data is analyzed and defined from the perspectives of game decision-making and cost. When facing the ramp vehicles with clear intention to merge, part of the mainline vehicles choose to accelerate to the inside to change lanes to cut out and at the same time to provide a gap for the ramp vehicles to merge to reduce the cost of driving efficiency. When the vehicle speed is higher, the mainline vehicle tends to change lane and cut out to reduce the loss. The vehicle game cut-out and merge model based on trajectory data can portray the vehicle game decision-making process and effectively shorten the distance of changing lane and merging, the average reduction of the distance of changing lane and merging is 11.51 m, and the average improvement of vehicle collision time is 6.77 s.
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