This study focuses on the overtaking lane-changing behavior in urban expressway interchange weaving areas, aiming to analyze the lane-change space selection characteristics of overtaking vehicles and explore control methods for overtaking lane-change behavior. Utilizing real-time trajectory data, this study analyzes the differences in gap selection and lane-changing point selection across various stages of the overtaking process. Machine learning methods were used to predict lane-change duration and lane-change space selection changes. Based on the prediction results, a speed optimization control model for overtaking lane-change behavior was established. The control effect of the model was then tested using a cellular automata simulation environment. The results show that under the control model, the proportion of vehicles selecting "excellent" and "good" grade lane-change gaps and the optimal lane-change point position increased by up to 18.86 and 6.89 percentage points compared to actual values. Additionally, the operating speeds of the three lanes in the weaving area increased by 6.91%, 1.71%, and 3.85%, respectively, and the spatiotemporal utilization rates of the lanes also exhibited better balance.
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