This paper presents an efficient approach for realistic modelling of internal transport systems. The weakness of the former methods in tracking the traffic when solving fleet management problems in container terminals and in surface mining is strongly criticized. Thus we provide a new conceptual model integrating notions borrowed from the traffic engineering field. The difference between our model and the classical ones is demonstrated. Our model reproduces important traffic behaviors such as the platoon formation and prorogation. Experimentations results showed the substantial improvement realized with the real-time trucks rerouting to face problems such as closed road and highly congested paths.