Highway 3a (r3a) as the Silk Road linking China - Laos - Thailand, was established in 2538 under the project "Economic Quadrangle", and officially launched at the end of March. 2551 onwards
Route No. 3A (R3A) silk road links between the China-Laos-Thai, starting with established last year 2538 (1995) under the project "square economy" and officially launched in late March, 2551 (2008).
Route No. 3 A (3 R A) is a Chinese emperors link between China and Laos - Thailand, was established in 2538 under the project "Square economy" and to enable a formal at the end of March 2551.