Road travel time prediction model based on improved spatiotemporal graph convolutional network

To enhance the accuracy of travel time prediction in road networks,a spatiotemporal graph convolutional network model based on attribute enhancement and attention mechanisms was proposed considering spatial dependencies,temporal dependencies,and weather impact of travel time. First,an attribute enhancement unit was constructed to integrate travel time and weather information. Subsequently,spatial dependencies were captured using a graph convolutional network,and temporal dependencies were captured using gate-recurrent units. An attention mechanism was employed to enhance the model's learning of features. Finally,the model was utilized to predict future travel times at 15,30,45,and 60 min intervals on a real dataset. The results show that the root mean square error (RMSE)of the prediction results are 0. 045 3,0. 045 6,0. 045 7,and 0. 046 8,respectively,which are better than other models. When temporal,spatial,and weather factors are considered,a reduction of about 10. 3% in prediction error is observed compared with scenarios without weather consideration. Similarly,a reduction of about 24. 2% in prediction error is observed compared with scenarios without accounting for spatial dependency. It shows that the model can better describe the spatiotemporal dependence and the influence of external conditions. © 2024 Southeast University. All rights reserved.