Using Fuzzy Programming Approach for Efficiency and Equity Issues in Highway Investment Decision-Making
Jennifer Yuh-Jen Wu
|關鍵字:||模糊規劃法;路網投資決策;效率;垂直式公平;水平式公平;可及性;妥協解;fuzzy programming;highway investment decision-making;efficiency;vertical equity;horizontal equity;accessibility;compromised solution|
To facilitate equal regional development, the decision-making of highway investment should consider not only cost efficiency but also issue of equity, which is seldom mentioned in past researches. The goal of this research is to develop a practical method for highway investment decision-making to deal with the issues of both efficiency and equity. In highway investment, we should provide people reasonable accessibility from every main city in every region to the regional center. We could optimize the accessibility for main cities in view of efficiency, and simultaneously minimize the difference in accessibility for main cities in the same region and to minimize that difference among regions to maintain both horizontal equity and vertical equity. Based on this concept, the basic model with multi-objective formulation was proposed first in this research and then modified as a revised model to make the decision-making process more reasonable and practical. Case studies of highway investment for western Taiwan were formulated in both models with different scenarios to show the impact of assumptions in future travel speed, total budget, complementary property among links, and exclusive property among alternatives. Using the fuzzy programming, the revised model effectively yielded the compromised solutions for all the cases in view of efficiency and equity. The research also covers the equity in budget allocation among cities, which was processed by restricting the upper bound of the budget share for each main city according to its socio-economic attributes. Besides, to expand the revised model for more flexible use, alternative travel cost/benefit measures were discussed and consumers’ surplus in elastic travel demand was proposed for the future study. For the simplification of objectives in equity, the travel-time target model and travel-speed target model were proposed with alternative equity measures. Furthermore, for the travel-speed target model with a target of 60 km/hr, each minimal budget was obtained in terms of given compromise grades to demonstrate the advanced decision-making process.
|Appears in Collections:||Thesis|