高速公路作为国民经济和社会发展的重大基础设施,其建设对社会经济的发展、生产力的合理布局、区域间的合作及投资环境的改善等都具有较大的影响。然而由于高速公路建设和维护成本高,资金投入大,投资回收期长,具有典型的资本密集型特征,资金缺口一直是制约高速公路建设发 As a major infrastructure for national economy and social development, the construction of expressways has great influence on the development of society and economy, the rational distribution of productive forces, the cooperation among regions and the improvement of investment environment. However, due to the high cost of highway construction and maintenance, capital investment, long payback period and typical capital-intensive features, the funding gap has always been to restrict the construction of expressways