| Company/Address | System | Country | Scope | Date of original | Date of certificate | Valid Untill | Status |
| ROUTE ONE ENGINEERING CO., LTD. 22/16 Moo. 3, Na Mai Subdistrict, Lat Lum Kaeo District, Pathum Thani Province 12140 | ISO9001:2015 | Thailand | ‘”Manufacturing of Tapered Steel Pole for Highway Lighting, Flag Pole, Highway Guardrail and Hot Dip Galvanized Steel Conduit” | May 26’2025 | May 26’2025 | May 25’2028 | Accepted |