Phet Kasem Road

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Thai Highway-4.svg

Thailand Route 4
ทางหลวงแผ่นดินหมายเลข 4
Thanon Phetchakasem
Road sign in Ratchaburi
Route information
Part of
Length: 1,274 km (792 mi)
Existed: 1950 – present
Major junctions
North end: Bangkok
South end: Sadao checkpoint, Malaysia-Thailand border
Major cities: Nakhon Pathom, Chumphon, Phatthalung, Hat Yai, Sadao
Highway system

Highways in Thailand


Phet Kasem Road (Thai: ถนนเพชรเกษม, rtgsthanon phet kasem)[1] or Thailand Route 4 (Thai: ทางหลวงแผ่นดินหมายเลข 4, ) is one of the four major highways in Thailand, along with Phahonyothin Road (Route 1), Mittraphap Road (Route 2), and Sukhumvit Road (Route 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, Phangnga, Krabi, Trang, Phatthalung and Songkhla, linked to North-South Expressway (NSE) of Malaysia at Sadao pass and Bukit Kayu Hitam pass.

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.