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The purpose of the study are to study the roles of the expressway and rapid Transit of Thailand and private sector in the investment of the infrastructure of the Authority, to find out appropriate role of the undertaking, and to research problems and obsearchs faced by the Authority. Via qualitative methods. Data were collected by in-depth interviews of this involved in the projects, purposively selected. It was found from the study that: (1) The Past roles of the Authority are to responsible for ground and underground transportation facility ties by ways of planning and operating them in evidence with the Act, rules and regulations and under the guidance and direction of the Minister in charge. The Authority is, in short, responsible for designing project proposal, project implementation and supervision and monitor of the projects (2) Its main roles were to set forth in the Act on state-owned enterprise, B.E. 2556; in it, the Authority has the project implementation role vid a vis monitoring and follow-up roles and role in revising the contract (4) There are 3 projects responsible by the Authority Kathu-Patong in Phuket, Rama3-Daokhanong and Stage 3 northbound. (3) As to problems and Obstacles faced by the Authority, it has be succinctly stated as follows: (1) The Authority Should be will aware of problems and Obstacles faced by it and resolve them accordingly with speed and effectiveness; (2) The reform of the authority structure should be in place; and (3) participation of the civil society in this matter is a must for the Authority in the year to come.
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