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湖南省怀化市东部的雪峰山素有“天险”之称。320国道以最大纵坡度19.6％(国家标准山区公路纵坡度不能超过8％),最小曲线半径7米(国家标准山区公路最小平曲线不低于15米),转过331道弯,穿越海拔1934米的雪峰山顶。全程30公里,名为国道,却被国家定为等外级公路。一年雨雾达280多天,冰冻达40多天。“雪峰山,山连山,331道弯,弯弯都是鬼门关。”多少年流传下来的民谣就是雪峰山的真实写照。 据史书记载,320国道雪峰山路段是1939年国民政府组织
Snow Mountain in eastern Huaihua City, Hunan Province, known as “natural risk” said. 320 National Road to the maximum longitudinal gradient of 19.6% (national standard mountain road longitudinal gradient can not exceed 8%), the minimum curve radius of 7 meters (national standard mountain road minimum curve of not less than 15 meters), turned 331 bends, through the elevation of 1934 The peak of the snow-m. The entire 30 kilometers, called the national highway, but the country has been set as the outer highway. Rain and fog more than 280 days a year, frozen up to 40 days. “Xuefeng Mountain, Hill Hill, 331 Bend, bend is a hell.” Folk songs passed down for many years is a true portrayal of Xuefeng Mountain. According to historical records, Xuefeng Mountain Road 320 State Road is the national government organization in 1939