Evolution of public transit modes in a commuter corridor
mode - bus, mode - rail, economics - economies of scale, economics - capital costs, economics - operating costs, planning - service rationalisation
Public transit modes, Transportation system evolution, Feeder service, Rail line extension
This paper explores how the selection of public transit modes can be optimized over a planning horizon. This conceptual analysis sacrifices geographic detail in order to better highlight the relations among important factors. First, a set of static models is proposed to identify which type of service, e.g., bus only, rail only, or bus and rail, is the most cost-effective in terms of the average trip cost for given demand. After analyzing essential factors in a long-term planning process, e.g., economies of scale in rail extension and future cost discounting, a dynamic model incorporating such considerations is formulated to optimize the decision over a planning horizon. While analytical solutions can be obtained for some decision variables, the final model is solved with a graphical method by exploring the tradeoffs between the initial and recurring costs. Major findings from this study include: (a) there exists a minimum economic length for a rail line, which can be determined numerically; (b) economies of scale favor large extensions and excess supplied capacity; (c) the rail-only service is largely dominated by the feeder-trunk service, even in the long run.
Permission to publish the abstract has been given by Elsevier, copyright remains with them.
Sun, Y., Guo, Q., Schonfeld, P., & Li, F. (2017). Evolution of public transit modes in a commuter corridor. Transportation Research Part C: Emerging Technologies, Vol. 75, pp. 84–102.