Phet Kasem Road

National Highway 4 shield}} ถนนเพชรเกษม Thanon Phetkasem
ทางหลวงแผ่นดินหมายเลข 4
ถนนเลียบชายฝั่งพม่า, ถนนกาญจนวณิชย์ Thanon Kanchanawanit, Burma Coast Road
Route information
Part of File:AH2-T.svg AH2 File:AH123-T.svg AH123
Existed	1950–present
Major junctions
North end	(Starting from Phetkasem Road) Naow Chamnian Bridge in Bangkok Yai, Bangkok (Beginning of Highway 4) Phetkasem Road, km.26+420 in Om Yai, Sam Phran, Nakhon Pathom
Major intersections	File:Thai Motorway-f9.svgAH2-T in Bang Khae, Bangkok File:Thai Motorway-t91.svg in Nakhon Pathom (Planned) File:Thai Highway-338.svgAH2-TAH123-T in Nakhon Chai Si, Nakhon Pathom File:Thai Motorway-t8.svg in Nakhon Chai Si, Nakhon Pathom File:Thai Highway-375.svg in Mueang Nakhon Pathom, Nakhon Pathom File:Thai Highway-323.svgAH123-T in Ban Pong, Ratchaburi File:Thai Highway-325.svgFile:Thai Highway-3090.svg in Bang Phae, Ratchaburi File:Thai Highway-376.svgAH2-T in Mueang Ratchaburi, Ratchaburi File:Thai Highway-330.svgFile:Thai Highway-3238.svg in Mueang Ratchaburi, Ratchaburi File:Thai Highway-376.svgAH2-T in Mueang Ratchaburi, Ratchaburi File:Thai Highway-35.svg in Pak Tho, Ratchaburi File:Thai Motorway-t8.svg in Thayang, Phetchaburi File:Thai Highway-37.svgAH2-T in Cha-am, Phetchaburi File:Thai Highway-37.svgAH2-T in Pranburi, Prachuap Khiri Khan File:Thai Highway-326.svg in Mueang Prachuap Khiri Khan, Prachuap Khiri Khan File:Thai Highway-360.svg in Thasae, Chumphon File:Thai Highway-41.svgAH2-T, File:Thai Highway-327.svg in Mueang Chumphon, Chumphon File:Thai Highway-412.svg in Mueang Ranong, Ranong File:Thai Highway-401.svg in Takua Pa, Phang Nga File:Thai Highway-402.svg in Takua Thung, Phang Nga File:Thai Highway-415.svg in Ao Luek, Krabi File:Thai Motorway-t83.svg (Planned)/File:Thai Highway-44.svg in Ao Luek, Krabi File:Thai Highway-403.svg in Huai Yot, Trang File:Thai Highway-419.svg in Mueang Trang, Trang File:Thai Highway-403.svg in Mueang Trang, Trang File:Thai Highway-419.svg in Mueang Trang, Trang File:Thai Highway-41.svgAH2-T, File:Thai Highway-4285.svg in Mueang Phatthalung, Phatthalung File:Thai Highway-406.svg in Rattaphum, Songkhla File:Thai Highway-414.svg in Bang Klam, Songkhla File:Thai Motorway-t8.svg (Planned)/File:Thai Highway-43.svg AH18-T, File:Thai Highway-407.svg in Hat Yai, Songkhla File:Thai Highway-425.svg in Hat Yai, Songkhla (Planned) File:Thai Highway-42.svg in Sadao, Songkhla File:Thai Motorway-t84.svg (Planned)/File:Thai Highway-4369.svg in Sadao, Songkhla
South end	File:MYS Jkr-ft1.svg FT 1, File:Mes-e1.svg E1 in Sadao Checkpoint, Sadao, Songkhla
Location
Country	Thailand
Provinces	Bangkok, Samut Sakhon, Nakhon Pathom, Ratchaburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang, Phatthalung, Songkhla
Major cities	Bangkok, Nakhon Pathom, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang Phatthalung, Hat Yai, Sadao
Highway system
Highways in Thailand Motorways Asian Highways

Phet Kasem Road (Thai: ถนนเพชรเกษม, RTGS: Thanon Phet Kasem, pronounced [tʰā.nǒn pʰét kā.sěːm]) or Highway 4 (Thai: ทางหลวงแผ่นดินหมายเลข 4, File:AH2-T.svg AH2) 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 1,310.554 km, route 4 is the longest highway in Thailand.

History

File:MRT Bangkae station - view toward Lak Song station.jpg

Bang Khae MRT station and passing Phet Kasem Road (outbound)

The construction of the road was finished in 1950 and was named "Phet Kasem" on December 10, 1950 in honour Luang Phet Kasemwithisawasdi (Tham Phetkasem), formerly the seventh director deputy general of the State Highways Department. Before that, it had been called "Bangkok–Khlong Phruan Road" (ถนนกรุงเทพ–คลองพรวน). Luang Phet Kasemwithisawasdi was the royal scholar of the State Railway Department (now State Railway of Thailand). He studied civil engineering in England and returned to work for the State Railway Department and then transferred to the State Highways Department. Phet Kasem Road was built during the period when Luang Phet Kasemwithisawasdi was the deputy director general of the State Highways Department. The road was named under the policy of the government of Major General Por Phibunsongkhram who named the road after the chief engineer who supervised the construction and gave the instructions.

Route

Starts at Naowa Chamnian bridge, Bangkok Yai district and goes through the following districts of Bangkok : Phasi Charoen, Bang Khae and Nong Khaem. The provinces along the road are Samut Sakhon, Nakhon Pathom, Ratchaburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang, Phatthalung and Songkhla. It is linked to the North–South Expressway (NSE) of Malaysia at the Sadao-Bukit Kayu Hitam border. Three sections of the highway are also the Asian Highway AH2.

• From Nakhon Pathom to Chumphon
• From Phatthalung to Malaysia border at Bukit Kayu Hitam, where it connects to the North–South Expressway (Malaysia) and Federal Route 1

See also

• Thai highway network