According to the meeting held on June 10th, 2015, the Commission for the Management of Land Traffic (CMLT) has approved the Development Guidelines on the Regional Mass Transit System (Nakhon Ratchasima) and assigned the Office of Transport and Traffic Policy and Planning (OTP) to study the Traffic and Public Transport Master Plan of Nakhon Ratchasima. On February 21st, 2018, the CMLT has approved the Traffic and Public Transport Master Plan of Nakhon Ratchasima as proposed by OTP and has endorsed the Mass Rapid Transit Authority of Thailand (MRTA) in corporate with OTP to undertake the project implementation with one route at a time bases on the priority basis. Subsequently, OTP has submitted the project priority instruction which would initially start with the Green Line.