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瑞士阿尔卑斯山下的圣哥特哈德公路隧道,全长约17公里,是目前世界上最长的公路隧道。该主隧道长16.32公里,如包括戈歇尔入口处的防雪崩的设施则为16.92公里;隧道的车道宽7.9米,可供两车并行,两侧人行道各宽70厘米,隧道净高4.5米,最高顶点海拔1,175米。隧道内部为弧形曲线拱顶,并装饰有波浪式花纹,以便减轻行车时的单调色彩。另外,在主隧道两旁,平均每隔30~*米就设有一处石砌的凹地,供产生故障的车辆紧
The St. Gotthard highway tunnel under the Swiss Alps, with a total length of about 17 kilometers, is by far the longest road tunnel in the world. The main tunnel is 16.32 kilometers long and includes 16.92 kilometers of avalanche-proof facilities at the entrance to Gordan. The tunnel has a width of 7.9 meters and two cars can be used in parallel. The width of each sidewalk is 70 cm and the height of the tunnel is 4.5 meters , The highest point of elevation 1,175 meters. The inside of the tunnel is curved curved domes and decorated with wavy patterns to reduce monotonous colors while driving. In addition, on both sides of the main tunnel, an average of 30 ~ * m every stone with a concave, for the breakdown of the vehicle tight