Vehicle Classification in Intelligent Transportation Systems: Enhanced CNN Approach and Data Set Expansion

초록

Vehicle classification systems are a crucial component of intelligent transportation systems (ITS). Improving the accuracy and efficiency of image recognition for vehicle classification based on the number of axles is vital for intelligent toll systems on highways and for pavement structure design. However, current research faces challenges in the segmentation of trucks due to the limited range of vehicle types covered in existing data sets, which affects the potential of ITS to enhance transportation efficiency and achieve precise traffic management. To address this issue, a new data set comprising 21,240 images covering 10 different vehicle types was created, and an improved vehicle classification method based on convolutional neural networks (CNN) was proposed. The model's classification performance was evaluated using metrics such as accuracy, precision, recall, and F1 score, while also analyzing the sensitivity of model performance to hyperparameters like learning rate, epochs, iterations, and optimizers. Results showed that the improved model achieved a classification accuracy of 98.8%, with both precision and recall at 97.3%, and an F1 score of 97.2%. Furthermore, when using the Adam optimizer, especially with a learning rate of 1.0×10-7, 70 epochs, and 1,500 iterations, the model performed best in classifying various vehicle types and truck axles. Compared with other CNN models such as visual geometry group (VGG)-16 and GoogLeNet, as well as existing vehicle classification models, the improved AlexNet model achieved a classification accuracy of 98.8%. Accurate axle number recognition not only ensures fair and reasonable toll charges, enhancing highway operational efficiency and economic returns, but also plays a crucial role in assessing pavement load-bearing capacity and ensuring the scientific design and durability of road surfaces. Therefore, the proposed model not only improves the efficiency and accuracy of toll collection and pavement design but also offers significant economic and social benefits for related applications. © 2025 American Society of Civil Engineers.

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