2025 年 16 巻 論文ID: PP4049
In many countries, population growth and economic development are anticipated, necessitating the planning of transportation networks capable of accommodating future domestic intercity passenger transport demand. In doing so, it is required to design networks that ensure economic sustainability, in which operations can continue without ongoing government subsidies; environmental sustainability, characterized by low energy consumption and minimal environmental impact; and social sustainability, which promotes equitable service provision across different regions. To achieve these goals, it is important to appropriately integrate multiple transportation modes that differ in cost, speed, applicable distance range, and environmental burden, based on the geography and other conditions.
This study presents a comprehensive methodology to derive insights into the trade-off relationships among the different dimensions of sustainability, as well as the roles and appropriate shares of various transportation modes, through the implementation of a network optimization model that incorporates endogenous demand and fare structures under multiple carbon dioxide emission constraints, applicable to any specified geography. In order to demonstrate the output of this methodology, we conducted an example analysis on a hypothetical network inspired by Japan.
