城记 | 同济大学教授陈小鸿：“第二高铁”建设背后的“三把标尺”考量

Core Viewpoint - The article discusses the importance of transportation infrastructure in urban development, emphasizing the shift in focus from merely having transportation options to improving their quality and efficiency as cities evolve [2][5]. Group 1: Transportation Infrastructure Development - The Chinese government has released guidelines to promote high-quality urban development, highlighting the integration of urban clusters and metropolitan areas as a key task [2]. - The National Transportation Department reported that China's high-speed rail network, the largest globally, has achieved 81.5% completion, with operational mileage reaching 48,000 kilometers, covering over 97% of cities with populations exceeding 500,000 [4]. Group 2: Shift in Transportation Planning Focus - The core of urban transportation planning has transitioned from "whether there is" to "how good it is," focusing on enhancing service quality and capacity through denser networks and diverse travel options [5]. - The construction of "second high-speed rail" lines, such as the Beijing-Shanghai and Chengdu-Chongqing lines, aims to fill gaps in existing networks and improve service to smaller cities [5][6]. Group 3: Regional Transportation Planning - Specific projects like the second high-speed rail from Beijing to Shanghai will connect previously underserved areas, while the Chengdu-Chongqing line will significantly reduce travel time [6]. - The planning of the Guangzhou-Shenzhen second high-speed rail aims to connect major airports and address transportation gaps in urban areas [6]. Group 4: Multi-Dimensional Transportation Systems - Shanghai is exploring multi-modal transportation systems, integrating various rail forms to enhance cross-regional connectivity [7]. - The concept of using "three metrics"—land scale, economic density, and demand intensity—has been proposed for effective regional transportation planning [7][9]. Group 5: Economic and Technical Considerations - The article emphasizes that transportation planning should not solely focus on speed but also consider the economic feasibility and the specific needs of different regions [8][10]. - The potential application of magnetic levitation technology in Shanghai's new development areas is highlighted, with a focus on its ability to meet high-frequency commuter demands [11].