针对现有的有效路径和有效路段两个概念存在的缺点 ,通过引入量化指标——临界相对差重新定义它们 ,对改进的多路径分配模型进行了深入探讨 ,并通过一个路网实例进行验证 ,取得了满意的结果 .

To address the weaknesses in existing definitions of effective links and effective paths, this paper presents modified definitions based on a quantitative and flexible index, the critical relative deviation. An improved multi-path assignment model based on the new definitions is investigated and numerical results show that it yields a more realistic assignment.