Phahonyothin Road

National Highway 1
ทางหลวงแผ่นดินหมายเลข 1
ถนนพหลโยธิน Thanon Phahon Yothin
Route information
Part of AH1 AH2 AH12
Length	1,005 km (624 mi)
Existed	Before 1936–present
Major junctions
South end	Bangkok, Victory Monument
North end	Mae Sai district, Chiang Rai, border to  Myanmar
Location
Country	Thailand
Provinces	Pathum Thani, Ayutthaya, Saraburi, Lopburi, Nakhon Sawan, Chainat, Kamphaeng Phet, Tak, Lampang, Phayao
Highway system
Highways in Thailand Motorways Asian Highways

Phahonyothin Road (Thai: ถนนพหลโยธิน, RTGS: Thanon Phahon Yothin, pronounced [tʰā.nǒn pʰā.hǒn jōː.tʰīn]) or Highway 1 is a main road in Bangkok and one of the four primary highways in Thailand, which include Mittraphap Road (Highway 2), Sukhumvit Road (Highway 3), and Phet Kasem Road (Highway 4). It begins at Victory Monument in Bangkok and runs north to the Burmese border, with a total length of 1,005 km (624 mi).