The IMT-GT Roadmap identified four economic connectivity corridors (ECCs) as key to support increased trade, investment and tourism through strengthening regional connectivity. These are the (i) Extended Songkhla-Penang-Medan; (ii) Straits of Melaka; (iii) Banda Aceh-Medan-Pekanbaru-Palembang; and (iv) Melaka-Dumai. Development of these economic corridors was declared a Flagship Project of IMT-GT at the 13th Ministerial Meeting in September 2006. Subsequently, a fifth maritime corridor, Ranong-Phuket-Aceh has also been identified by IMT-GT.
Three studies on the ECCs have been completed: