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云南地处高原,山区面积占94%。全境山形陡峭,最高海拔6740米,最低海拔76.4米,高差近6664米。山高谷深、江河纵横的地形地貌,使得云南盘山公路多、临崖临江公路多,行车安全压力大。长期以来,受资金、环境等众多因素的制约,云南公路在数量和规模得到快速增长的同时,公路配套设施还不能全面适应国民经济和社会发展的要求。一些路段在提高路面等级的时候,公路线
Yunnan is located in the plateau, mountainous area accounts for 94%. The steep mountains, the highest elevation of 6740 meters, the minimum altitude of 76.4 meters, the elevation of nearly 6664 meters. High mountains and deep valleys, topography of the river aspect, making the Panshan Road in Yunnan Province, Cliff Linjiang more roads, traffic safety pressure. For a long time, due to the constraints of many factors such as capital and environment, while the number and scale of Yunnan highways have been rapidly increasing, the road facilities can not fully meet the requirements of national economy and social development. Some sections of the road to improve the grade of the road