Phetkasem Road
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| ทางหลวงแผ่นดินหมายเลข 4 | |
| Route information | |
Part of  | |
| Length: | 1,274 km (792 mi) |
| Major junctions | |
| North end: | Bangkok |
| South end: | Sadao checkpoint, Malaysia-Thailand border |
| Location | |
| Major cities: | Nakhon Pathom, Chumphon, Phattalung, Hat Yai, Sadao |
| Highway system | |
| Motorways | |
Phetkasem Road (Thai: ถนนเพชรเกษม, also Petchkasem Road) 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 Phetkasemwithisawasdi, 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, Phang Nga, Krabi, Trang, Phattalung 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.
- From Nakhon Pathom to Chumphon
- From Phattalung to Ban Khu Ha
- From Hat Yai to Malaysia border, where it connects to the North-South Expressway, Malaysia
See also
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