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Abstract: Sierra de Valle Fertil is a mountain range located in the west of Argentina (San Juan province). It is crossed by the National Road 150 by a length of 40 km that includes six bidirectional tunnels with a total length of 2000 meters. All tunnels have the same horseshoe shape cross section with an area of 70 m2. They were designed following criteria given by "Cross Section Design of Bidirectional...