Group 1 - The completion of the Cangbing Mountain Tunnel marks a significant milestone in the 320 National Road project, which aims to enhance the traffic network in the Hangzhou metropolitan area [1] - The project features a dual six-lane highway design with a mainline speed of 80 km/h, improving connectivity and optimizing spatial structure for urban and rural integration [1] - The Bai Zhang Line improvement project has been completed, providing a second efficient route for traffic in the Jian De area, significantly reducing congestion on the 320 National Road [2] Group 2 - The Bai Zhang Line spans 4.1 kilometers and connects key areas, alleviating traffic pressure and enhancing overall road network accessibility, cutting cross-regional travel time by approximately 50% [2] - The feasibility study for the Qiantang River navigation channel improvement project has been approved, which is crucial for enhancing regional transportation and supporting sustainable economic development [3]