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目前,我国西部地区开发正处在加速时期,西部的高速公路建设也正如火如荼地进行着,因此西部地区的公路建设前景十分广阔,由于西南地区大多为山岭重丘区,年降雨量大,高速公路选线时不可
At present, the development of the western region of our country is in an accelerating period. The construction of the expressway in the west is also in full swing. Therefore, the road construction in the western region has a bright future. Since most of the southwestern regions are mountainous heavy hilly areas with large annual rainfall and high speed Highway route selection not