Analysis and Research on Interchange and Expansion options of Expressway

China's road network consists of numerous older expressways experiencing high traffic volumes and severe congestion necessitating urgent reconstruction and expansion efforts. This study discusses the reconstruction and expansion project of the Yinkun Expressway's Chongqing High-tech Zone to Rongchang District section with a detailed exploration of the entire design process. Through a comprehensive analysis the strengths and weaknesses of different plans are examined so as to determine the optimal plan. The design chosen saves costs while effectively addressing traffic demands. Additionally the study summarizes the valuable design insights gained from this interchange transformation aiming to provide valuable reference for similar interchange projects in the future.