The logo is specified by the ministrial proclamation dated 21 August 2008. (กฎกระทรวง กำหนดตราเครื่องหมายของการทางพิเศษแห่งประเทศไทย พ.ศ. ๒๕๕๑[1]) As part of legislation, it is in the Public Domain.
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Uploaded a work by Expressway Authority of Thailand from https://www.egov.go.th/th/government-agency/330 , https://th.wikipedia.org/wiki/ไฟล์:Exat.png , https://commons.wikimedia.org/wiki/File:Thailand_Kilometer_Sign_Expressway-เฉลิมมหานคร.svg with UploadWizard