The Southern Corridor is an important trade corridor between Bangkok and Ho Chi Minh–Vung Tau. The major trade flows are between Bangkok and the entry to Highway 359, which is being upgraded by ADB (Does this need update?) and the connecting link roads to Laem Chabang. This forms part of the eastern seaboard and has significant numbers of export industries. From Highway 359 eastward, the trade volume drops significantly and is restricted to bilateral trade passing through Aranyaprathet–Poipet, mainly destined for Phnom Penh. The link between Phnom Penh and Ho Chi Minh City through Bavet–Moc Bai is becoming increasingly important as Saigon Port develops. The heaviest volumes in the Viet Nam section are around Ho Chi Minh City, and, in the future, the new container areas out toward Vung Tau.