Phet Kasem Road

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ถนนเพชรเกษม Thanon Phetkasem
ทางหลวงแผ่นดินหมายเลข 4
ถนนเลียบชายฝั่งพม่า, ถนนกาญจนวณิชย์ Thanon Kanchanawanit, Burma Coast Road
Route information
Part of AH2 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	in Bang Khae, Bangkok in Nakhon Pathom (Planned) in Nakhon Chai Si, Nakhon Pathom in Nakhon Chai Si, Nakhon Pathom in Mueang Nakhon Pathom, Nakhon Pathom in Ban Pong, Ratchaburi in Bang Phae, Ratchaburi in Mueang Ratchaburi, Ratchaburi in Mueang Ratchaburi, Ratchaburi in Mueang Ratchaburi, Ratchaburi in Pak Tho, Ratchaburi in Thayang, Phetchaburi in Cha-am, Phetchaburi in Pranburi, Prachuap Khiri Khan in Mueang Prachuap Khiri Khan, Prachuap Khiri Khan in Thasae, Chumphon , in Mueang Chumphon, Chumphon in Mueang Ranong, Ranong in Takua Pa, Phang Nga in Takua Thung, Phang Nga in Ao Luek, Krabi (Planned)/ in Ao Luek, Krabi in Huai Yot, Trang in Mueang Trang, Trang in Mueang Trang, Trang in Mueang Trang, Trang , in Mueang Phatthalung, Phatthalung in Rattaphum, Songkhla in Bang Klam, Songkhla (Planned)/ , in Hat Yai, Songkhla in Hat Yai, Songkhla (Planned) in Sadao, Songkhla (Planned)/ in Sadao, Songkhla
South end	FT 1, 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])^[1] or Highway 4 (Thai: ทางหลวงแผ่นดินหมายเลข 4, 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.