ถนนเพชรเกษม
Thanon Phetkasem |
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| Part of AH2 AH123 |
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| Existed | 1950–present |
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| 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 |
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| 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 |
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| South end | FT 1, E1 in Sadao Checkpoint, Sadao, Songkhla |
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| Country | Thailand |
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| Provinces | Bangkok, Samut Sakhon, Nakhon Pathom, Ratchaburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang, Phatthalung, Songkhla |
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| Major cities | Bangkok, Nakhon Pathom, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang Phatthalung, Hat Yai, Sadao |
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Phet Kasem Road (Thai: ถนนเพชรเกษม, RTGS: Thanon Phet Kasem, pronounced [tʰā.nǒn pʰét kā.sěːm]) 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.
