| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 95 === Expansion of public transportation infrastructures has been considered as a main policy for urban areas. In order to ease off finance pressure of government and raise self-liquidating ratio (SLR) of transportation infrastructures, economic and financial sustainability is an important factor in selection of public transportation infrastructures. Taipei Mass Rapid Transit System (Taipei MRT) creates high social benefit but its SLR is not brilliant because of its huge capital investment. This study aims to explore strategies of economic and financial sustainability for Taipei MRT. This research develops mathematical model which combines with welfare economics and full trip cost theories to analyze both efficiency and equity of transportation policies proposed. The evaluation is conducted for year 2003 to 2021 based on MRT system with the revenue/expenditure ratio 1.41, economic net present value 314,553 million NT dollars and IRR 19.80%. It is found that taxation policy on users of private motorized modes for construction cost of Taipei MRT would decrease social welfare. However, if we raise service level of Taipei MRT at the same time, it could compensate negative impact. In pricing policies, lower fare policy is an effective policy but could not approach sustainability without other packages. It is also shown that using bus rapid transit to replace MRT network can have net benefit in terms of economic and financial sustainability.
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