Phet Kasem Road

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National Highway 4 shield}}

National Highway 4
ทางหลวงแผ่นดินหมายเลข 4
Thanon Phet Kasem
Road sign in Ratchaburi
Route information
Part of
Length1,274 km (792 mi)
Major junctions
North endBangkok
South endSadao checkpoint, Malaysia–Thailand border
Major citiesNakhon Pathom, Chumphon, Phatthalung, Hat Yai, Sadao
Highway system
Highways in Thailand

Phet Kasem Road (Thai: ถนนเพชรเกษม, RTGSThanon Phet Kasem, pronounced [tʰā.nǒn pʰét kā.sěːm])[1] or Highway 4 (Thai: ทางหลวงแผ่นดินหมายเลข 4, ) is one of the four primary highways in Thailand, along with Phahonyothin Road (Highway 1), Mittraphap Road (Highway 2), and Sukhumvit Road (Highway 3). At 1,274 km, it is the longest highway in Thailand. It begins at Naowa Chamnian bridge in Bangkok Yai, Bangkok. It is named after Luang Phet Kasemwithisawasdi, the seventh director general of the Department of Highways.

The provinces along the road are Samut Sakhon, Nakhon Pathom, Ratchaburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Surat Thani, Phang Nga, Krabi, Nakhon Si Thammarat, Trang, Phatthalung and Songkhla. It is linked to the North–South Expressway (NSE) of Malaysia at Sadao and Bukit Kayu Hitam passes.

Three sections of the highway are also the Asian Highway AH2.

See also[edit]

Thai highway network


  1. ^ ราชบัณฑิตยสถาน. อ่านอย่างไร และ เขียนอย่างไร ฉบับราชบัณฑิตยสถาน. พิมพ์ครั้งที่ 22. กรุงเทพฯ : ราชบัณฑิตยสถาน, 2557, p. 58.