关键词: 区域运输系统, 系统动力学, 超载治理, 政策, 利益协调

Abstract: To solve the problem of profit conflict between freight owners and highway operator which was caused by overload trucking,a system dynamics model was established for policy evaluation.By simulating interactions and feedbacks among transport issues such as freight volume,pavement damage,highway transport capacity and transport time under different policy scenarios,mechanism of profit conflict was analyzed and effective policy was given.Simulation for the case of iron ore transportation system from Caofeidian to Tangshan was conducted,and the results showed that limiting vehicle loads was not an effective policy because the increase of transport cost and time cost of freight owners caused by this policy was much higher than the decrease of pavement maintenance cost of highway operator.It was showed that vehicle loads limitation should be implemented on the basis of modal shift by railway.When railway reached class Ⅱ,cost decrease of freight owners and highway operator was higher than railway construction investment,which was effective for profit coordination within the system.

Key words: regional freight transportation system, system dynamics, vehicle overload control, policy, profit coordination