1) Operate the mass rapid transit in Bangkok and its vicinity including in other provinces or between provinces in accordance with the Royal Decree. 2) Study, analysis and formulate the project and its plan in concerning to the mass rapid transit regarding to improve and modernize. 3) Perform the business involving mass rapid transit and other business on behalf of the benefit of MRTA and the people using its services. In 2002 after the reform in Government agencies, the authority of the Prime Minister in supervision of the Mass Rapid Transit Authority of Thailand was transferred to the Minister of Transport.