In terms of traffic volume, road transport is the most important mode of transportation. Moreover, it is the integration of the lagging areas in the region under the ASEAN Highway Network (AHN) project that would have significant benefit to the poorer areas of continental ASEAN region. However, the implementation of the Ministerial Understanding on the Development of the ASEAN Highway Network Project (5th ASEAN Transport Ministers Meeting, Ha Noi, 1999) is behind schedule, which required ASEAN Member States to upgrade all designated routes to “Class III” or above and to install road signs by 2004