中文摘要：

为衡量不同等级公路对公路货运发展的影响程度,基于公路网的网络结构特征,应用比较优势理论,采用通径分析方法,构建出衡量不同等级公路对公路货运发展的贡献度计量模型。研究结果表明：高等级公路是影响公路货运发展的主导因素,较低等级公路对公路货运发展的贡献主要通过高等级公路来实现;较低等级公路的集散功能与高等级公路的通过功能是相互制约的关系;要促进公路货运发展,不仅需要继续保持对高等级公路的建设投资,还要推进各等级公路的协调发展,进一步完善各等级公路的合理布局。

英文摘要：

In order to measure the influence level of different grades highway on the development of freight transportation, based on the structure characteristics of highway network, the comparative advantage theory and path analysis methods were used to build an algorithm model to get the contribution degree of different grades highway to the development of freight transportation. The results show that the freeway is the domain factor which impact the development of freight transportation, the low grade highway contribution is realized through freeway. There is mutual constraint relation between the pass-through function of high-grade highway and the distribution function of low-grade highway. The result indicates that the investment of high-grade highway should be maintained, at the same time, the rational distribution of highway network should be improved. 3 tabs ,1 fig ,17 refs.