Abstract:Caobao Road Expressway in Shanghai is an underground expressway dedicated to small passenger cars in the main urban area of Shanghai. The functional positioning of the project and the demonstrating analysis of service objects are introduced. The traffic prediction and analysis are conducted at multiple levels of the expressway system and regional road network systems. And the comprehensive upgrading measures of engineering and management simultaneously are put forward. improvement measures are proposed that combine engineering and management. For the project itself, an expressway route selection scheme for river routing is proposed, and the key node schemes for cross-sectional layout, elevated and underground interchanges, stacked scissor ramps are comprehensively compared, selected, analyzed and demonstrated. The design essentials of underground expressways are concluded and summarized, which has a certain reference value for the overall scheme design of similar projects.