Asian Highway 12 (AH12) is a route of the Asian Highway Network, with a length of 1,195 km (747 miles) that runs from AH3 in Nateuy, Laos, through Muang Xay, Luang Prabang, Vang Vieng, Vientiane, Nong Khai, Udon Thani, Khon Kaen, Nakhon Ratchasima, and Saraburi until its terminus at AH1 in Nong Khae District, Saraburi Province, Thailand.
The highway has been in use since 8 April 1994. Its US$30 million cost was financed by Laos and Thailand, with the exception of the First Thai-Lao Friendship Bridge, funded by the Australian government as development aid for Laos.
Sections Laos : Nateuy–Vientiane : Vientiane–Thanaleng (Vientiane Prefecture), First Thai–Lao Friendship Bridge
Thailand (Mittraphap Road): Nong Khai–Saraburi (Phahonyothin Road): Saraburi–Hin Kong, Nong Khae District
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