The Yuanbao Interchange Underground Interconnection — an under-construction project is invested by Sichuan Xixiang Expressway Construction and Development Co., Ltd., designed by Sichuan Highway Planning, Survey, Design and Research Institute Co., Ltd., and constructed by Sichuan Road and Bridge (Group) Co., Ltd. This project enables interconnection between expressways, with the entire interchange section built underground. The total length of the driving area reaches 9,973.9 meters. Verified by the WRCA, it has been confirmed as the “Largest Fully Underground Interchange of a Mountain Area Highway (under construction)”.