| Summary: | 碩士 === 臺灣大學 === 土木工程學研究所 === 98 === Taxi service is featured with convenience, speediness, door-to-door, privacy and comfort so that it has become a popular mode in urban area. With the rapid development of information and communications technologies, GPS-taxi has become a new trend since the distinguished operation performance especially when taxi operation costs increase rapidly. The current fleet size of taxi in Taipei Metropolitan Area has reached 54,747 vehicles while the ratio of GPS-taxi rose to only 16% by 2008.
However, most researches had established models to analyze the performance of cruising taxi market only. To realize the difference features and interactions between the cruising taxi and the GPS-taxi, this study aims to develop a mathematical model with a bi-level concept to explain the interaction of maximum profit objective for drivers and maximum social welfare objective for public sector, respectively. Furthermore, taxi market in Taipei Metropolitan Area is considered as a case study to verify the applicability of the model.
Numerical results showed that the optimal fleet size of taxi was 31,359 vehicles under the current market in which 8.96% of passengers use the dispatch service while 16% of taxis equipped with GPS. Meanwhile, with considering external effects, the optimal fleet size of taxi reduced to 30,743 vehicles. Comparing the existing fleet size of 54,747 in Taipei metropolitan, these optimal results of fleet size have shown an over-supply problem in taxi market. However, the efficiency of GPS-Taxi can also be verified. It was also shown that the ratio of dispatch-used passenger will be 11.18% when the ratio of GPS-taxi is about 60 percentages. In conclusion, the optimal fleet size of taxis estimated by this model might support the public sector to manage the quantity regulation.
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