For disaccord of private cost and social cost,the optimal decision of a van s owner is not the optimal decision of social resources relocation,which is accompanied by overload of freight market.

• 我国货运市场运价是当前竞争性市场供求作用的结果,货运市场私人成本与社会成本的偏离,导致单个货运车主基于既定市场价格的最优决策实际是偏离社会资源配置最优的,并伴随现时屡禁不止的超限超载。