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前 言 从世界各国对公路建设的特点来看,一是发展高速公路,二是通过技术改造来提高现有公路的通过能力。即在加强高标准公路建设的同时,对已建成的公路进行改造和提高,把公路建设的重点转向现有公路网的质量提高和养护方面来。这是公路建设发展的必然趋势。 我国公路总里程与工业发达的国家比较是少的,属公路网不发达的国家之一,且标准低、质量差。就湖南省来说,据1980年公路普查资料,现有公路符合标准等级的仅
Foreword From the characteristics of highway construction in all countries in the world, one is to develop expressways; the other is to improve the passing capacity of existing roads through technological transformation. That is, while strengthening the construction of high-standard highways, the existing highways have been transformed and upgraded to shift the focus of highway construction to the quality improvement and maintenance of the existing road network. This is the inevitable trend of highway construction. China’s total highway mileage is less than that of developed countries, and it is one of the underdeveloped road networks in the country with low standards and poor quality. In the case of Hunan Province, according to the 1980 census data, the existing highways meet only the standard grade