本文综述比较了新老宁六公路的技术等级,分析了一级公路的直接、间接经济效果,仅从直接受益来看,七年可收回全部投资,充分说明了宁六公路的投资效益是比较高的。 This article summarizes and compares the technical levels of Xin-Li-Ning-Liu-Liu Highway, analyzes the direct and indirect economic effects of the first-class highways, and from the perspective of direct benefits, all the investments can be recovered in the past seven years, fully demonstrating the investment returns of Ning-Liu Highway High.