Procurement of the construction of the sound barrier installation at the entrance to Pratunam Km. 0+225 and the entrance to the Sukhumvit checkpoint, Km. 4+200 B (Complaint against Mr. Sarun Thatsanakulpun) and the installation of a sound barrier on the Chalong Rat Khuang Expressway in the area of ​​km. 2+100 to km. 2+400 in the Ram Inthra - At Narong direction. (Complaint about Mr. Saknarin Chuasaeng) (EXPIRED)