Phahonyothin Road

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National Highway 1 shield}}
National Highway 1
ทางหลวงแผ่นดินหมายเลข 1
Thanon Phahon Yothin
Thanon Phahonyothin.png
Route information
Part of AH1 AH2 AH12
Length1,005 km (624 mi)
Major junctions
South endBangkok, Victory Monument
North endMae Sai district, Chiang Rai,
border to  Myanmar
ProvincesPathum Thani, Ayutthaya, Saraburi, Lopburi, Nakhon Sawan, Chainat, Kamphaeng Phet, Tak, Lampang, Phayao
Highway system
Highways in Thailand

Phahonyothin Road (Thai: ถนนพหลโยธิน, RTGSThanon Phahon Yothin, pronounced [tʰā.nǒn pʰā.hǒn jōː.tʰīn]) or Highway 1 is a major 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).


Mae Sai Pass

Phahonyothin Road was originally called Prachathipatai Road (Thai: ถนนประชาธิปไตย, Thanon Prachathipatai, literally "Democracy Road"), and reached just 22 km (14 mi) to Don Mueang. In 1938, Field Marshal Plaek Phibunsongkhram had the road extended from Don Mueang, through Bang Pa-In, Ayutthaya, Saraburi, Lopburi, and Singburi, making it 162 km (101 mi) long. The newly lengthened road was renamed Phahonyothin Road, in honor of General Phraya Phahol Pholphayuhasena (formerly Phot Phahonyothin), the second Prime Minister of Thailand and one of the heads of the 1932 revolution.[1]


In Bangkok, Phahonyothin Road originates in Ratchathewi district and crosses Phaya Thai, Chatuchak, Bang Khen, and Don Mueang districts before continuing into Pathum Thani Province, and on through Ayutthaya, Saraburi, Lopburi, Nakhon Sawan, Chainat, again through Nakhon Sawan, Kamphaeng Phet, Tak, Lampang, Phayao and finally Chiang Rai, ending in Mae Sai district, where it connects to Tachileik in Myanmar.

See also[edit]

Further reading[edit]


  1. ^ อรณี แน่นหนา, 2002. นามนี้มีที่มา. ประพันธ์สาส์น: กรุงเทพฯ.
    Orani Naenna, 2002. Naam Ni Mi Thi Ma. Praphansarn: Bangkok. (Brief histories of 129 place names in Bangkok.)

Coordinates: 13°50′51″N 100°34′48″E / 13.8474°N 100.5800°E / 13.8474; 100.5800