Recently, the Hankou Tunnel locating on the Xinxiang-Jincheng Expressway, constructed by CSCEC, was certified by Guinness World Records as the world's longest spiral tunnel, with a total length of 4,457 meters.

The Xinxiang-Jincheng Expressway spans 69.75 kilometers and serves as a vital highway connecting the provinces of Henan and Shanxi. The expressway's spiral tunnel system consists of nine tunnels that wind through the Taihang Mountains, with a total length of 28 kilometers. The Hanko Tunnel ranges in altitude from 784 meters to 893 meters, with an maximum elevation difference between the tunnel entrance and exit of 109 meters, and has a minimum radius of 700 meters.

The Xinxiang-Jincheng Expressway was completed and opened to traffic on December 26, 2022. It significantly enhances transportation, material flow, tourism development, and industrial and agricultural production between Henan and Shanxi.