Aiming at the problem that the traditional queue tail vehicle departure state prediction model is difficult to adapt to the uncertainty of queue dissipation, a queue tail vehicle departure state prediction model driven by trajectory data is proposed. By analyzing the shapes of queue dissipation trajectories and potential influencing factors, the uncertainty of departure state of tail vehicles is uncovered. Starting from the two stages of queue waiting and vehicle start-up, a feature set that influences the tail vehicle departure state is proposed. The extreme gradient boosting algorithm is employed to construct the prediction model, incorporating the SHapley Additive exPlanations(SHAP) interpretable machine learning framework to dissect the contributions of features, and to determine the optimal feature combination and model parameters. The research results indicate that the proposed XGBoost-based departure time prediction model achieves an average mean absolute percentage error(MAPE) of 5.74%, which is improved by 10% approximately compared with the kinematic model. The MAPE for the queue departure speed is 9.98%, improved about 6% over the kinematic model. Furthermore, the performance of the proposed model surpasses three commonly used machine learning methods of random forest, decision trees, and multi-layer perceptron neural networks. The research outcomes provide technical support for adjusting the minimum green light time of intersection signals and eco-driving of connected vehicles in the vehicle-road cooperative environment.
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