The Xiaoshan tunnel was the longest tunnel under construction in western Henan at that time, with a total length of 5,915 meters (2955 meters on the left and 2960 meters on the right). It was completed and opened to traffic in September 2012. It is one of the key control projects of the entire Lingbao-Lushi section of the Sanmenxia-Xichuan Expressway.