Thai highway network

A highway sign, bearing the Thai national symbol and the route number

The Thai highway network follows the left-hand traffic rule of the road. The network is the twin responsibility of the (DOH, Thai: กรมทางหลวง, Krom Thang Luang), and the Department of Rural Roads (DORR, กรมทางหลวงชนบท, Krom Thang Luang Chonnabot), under the oversight of the Transportation ministry of Thailand. Public highways (ทางหลวง, thang luang) are also called public roads (ถนนหลวง, thanon luang), especially when part of urban streets. The network spans over 70,000 kilometers across all regions of Thailand.^[1] Most are single carriageways. Dual carriageways have frequent u-turn lanes and intersections slowing down traffic. Coupled with the increase in the number of vehicles and the demand for a limited-access motorway, the Thai Government issued a Cabinet resolution in 1997 detailing the motorway construction master plan.^[2] Some upgraded sections of highway are being turned into a "motorway", while other motorways are not being built from highway sections.

Types of highways[]

The 1992 Highway Act (Thai: พระราชบัญญัติทางหลวง พ.ศ. 2535), revised as the 2006 Highway Act (Thai: พระราชบัญญัติทางหลวง (ฉบับที่ 2) พ.ศ. 2549), defines the following five highway types:^[3]

A special highway (Thai: ทางหลวงพิเศษ) or motorway is a high capacity highway designed for high speed traffic, for which the Department of Highways carries out construction, expansion, upkeep and repairs, and is registered as such. Motorway entrances and exits have controlled access, and controlled by the DOH. Registration of motorways is overseen by the Director General of the DOH.

A national highway (Thai: ทางหลวงแผ่นดิน) is a primary highway, part of the network connecting regions, provinces, districts, and other important destinations, for which the DOH carries out construction, expansion, upkeep and repairs. Registration of national highways is overseen by the Director General of the DOH.

A rural highway (Thai: ทางหลวงชนบท) or rural road is a highway for which the Department of Rural Roads carries out construction, expansion, upkeep and repairs. Registration of rural highways is overseen by the Director General of the DORR.

A local highway (Thai: ทางหลวงท้องถิ่น) or local route is a highway for which the local administrative organization carries out construction, expansion, upkeep and repairs. Registration of rural highways is overseen by the provincial governor.

A concession highway (Thai: ทางหลวงสัมปทาน) is a highway for which a legal government concession has been granted. Registration of concession highways is overseen by the Director General of the DOH.

Highway numbering[]

The first digit of a highway number indicates the region of Thailand it serves, with the number of digits indicating the highway classification.^[4] These regions are:

Northern Thailand.
Northeastern Thailand.
Central and eastern, including the upper south.
Southern Thailand, except the upper south.

A single digit indicates one of four highways connecting Bangkok to outlying regions:^[4]

Route 1 (Phahonyothin Road) to northern Thailand
Route 2 (Mittraphap Road) to northeastern Thailand
Route 3 (Sukhumvit Road) to eastern Thailand
Route 4 (Phet Kasem Road) to southern Thailand

Two digits indicate a principal highway within a region, such as Route 22 in the northeast between Udon Thani and Nakhon Phanom.^[4]

Three digits indicate a regional secondary highway, such as northeastern Route 202 between Chaiyaphum and Khemarat, and central Route 314 between Bang Pakong and Cha Choeng Sao.^[4]

Four digits indicate an intra-province highway connecting a provincial capital to its districts, or between important sites, such as northern Route 1001 between the Route 11 intersection and Amphoe Phrao, and southern Route 4006 between the Route 4 intersection (Ratchakrut) and Lang Suan.^[4]

Highways by region[]

Northern Thailand[]

Sign on Route 12 in the north of the country

Bridge construction on route 108

Route 12/Asian Highway 16 in Phetchabun Province being widened (2013 CE)

Highway 1 (Phahonyothin Road): Bangkok – Chiang Rai and continuing to Tachilek, Burma as AH1 AH2
Highway 11: In Buri, Sing Buri – Chiang Mai
: Tak – Khon Kaen as AH16 and continues into northeastern Thailand superseding Route 2042 : Somdet, Kalasin-Mukdahan
: Kamphaeng Phet – Nan as AH13
: Si Satchanalai, Sukhothai – Uttaradit
: Rong Kwang, Phrae – Ngao, Lampang
: Kosamphi Nakhon, Kamphaeng Phet – Tak
: Tak – Mae Sariang, Mae Hong Son
: Thoen, Lampang – Chiang Mai
: Chiang Mai – Mae Chan
: Chiang Mai – Mae Hong Son
: Fang – Mae Suai
: Chiang Rai – Mae Sai, Chiang Rai (now superseded by Route 1)
: Phichit Bypass Road
: Kamphaeng Phet Bypass Road
: Wang Thong – Khao Sai (now superseded by Route 11)
: Phichit – Phetchabun
: Lamphun town route
: Kamphaeng Phet - Phichit
: Lamphun - San Pa Tong, Chiang Mai
: Nakhon Sawan – Phitsanulok
: Chiang Mai – Chiang Rai
: Uttaradit town route (now superseded by Route 102)
: Mueang Phayao - Wiang Pa Pao
: Chiang Mai Outer Ring Road
: Nakhon Sawan Bypass Road as AH1 AH2
: Sai Bypass Road
: Sukhothai Bypass Road as AH16
: Phitsanulok Bypass Road
: Lampang Bypass Road
: Mae Hong Son Bypass Road
: Phrae Bypass Road as AH13
: Entrance to Thai-Myanmar Friendship Bridge over Moei River (Tak Province)
: Chiang Mai - Phrao
: Chiang Mai - Doi Suthep-Pui National Park
: Chiang Mai – Mae On
: Entrance to Doi Saket
: Chom Thong - Doi Inthanon summit
: Hwy 108 (Ban Nong Hai) - Hwy 106 (Ban Pak Thang)
: Hot - Wang Luang
: San Pa Tong - Ban Kat
: Doi Saket - Pa Bong - San Pa Kha
: Route 11 (Chiang Mai) - Mae Sai (now superseded by Route 118)
: Tha Thong - Hat Kruat
: Route 11 (Pa Khun) - Muang Chet Ton (now superseded by Route 117)
: Nan - Lao border at Huai Kon (now superseded by Route 101)
: Mae Sot - Mae Sariang (now superseded by Route 105)
: Hwy 108 (Ban Kio Lom) - Omkoi - Mae Tuen
: Wang Kaphi - Phrom Phiram (now superseded by Route 117)
: Route 12 (Phitsanulok) - Naresuan Dam (now superseded by Route 117)

Northeastern Thailand[]

Highway 2 (Mittraphap Road, Thai: ถนนมิตรภาพ): Saraburi–Nong Khai as AH12.
(Khotchaseni Road, Thai: ถนนคชเสนีย์): Saraburi–Loei.
(Nittayo Road, ถนนนิตโย): Udon Thani–Nakhon Phanom as AH15.
(Chaeng Sanit Road, ถนนแจ้งสนิท): Ban Phai, Khon Kaen–Ubon Ratchathani.
(Sathonlamak Road, ถนนสถลมารค): Nakhon Ratchasima–Ubon Ratchathani.
: Sikhio, Nakhon Ratchasima–Chiang Khan, Loei
(Arunprasert Road, Thai: ถนนอรุณประเสริฐ): Chaiyaphum–Khemarat, Ubon Ratchathani
: Ratchasima Bypass Road
Highway 205 (Suranarai Road, Thai: ถนนสุรนารายณ์): Lopburi–Nakhon Ratchasima
(Phimai Road)
: Phon, Khon Kaen-Non Daeng, Nakhon Ratchasima via Ban Mai Chaiyaphot, Buriram
: Maha Sarakham-Khon Kaen (Tambon Tha Phra)
: Khon Kaen-Yang Talat, Kalasin (now superseded by Route 12)
: Wang Saphung, Loei–Udon Thani
: Chiang Khan, Loei–Nong Khai
(Chayanggoon, Thai: ถนนชยางกูร): Nong Khai–Ubon Ratchathani
(Thinanon Road, Thai: ถนนถีนานนท์): Maha Sarakham–Sakon Nakhon (now superseded by Route 12 only Yang Talat-Somdet)
: Kalasin–Chong Chom, Kap Choeng, Surin
: Roi Et–Tha Tum, Surin
: Udon Thani Ring Road
: Warin Chamrap-Sirindhorn (Ubon Ratchatani)
: Mueang Buriram-Nang Rong (Buriram)
: Borabue, Maha Sarakham-Ban Kruat, Buriram
Sisaket - Khukhan
: Sisaket - Khao Phra Wihan National Park
Highway 222: Phang Khon, Sakon Nakhon-Bueng Kan
: Sakon Nakhon-That Phanom, Nakhon Phanom
: Nakhon Ratchasima–Kap Choeng, Surin
: Chaiyaphum-Phetchabun-Nakhon Sawan
: Nakhon Ratchasima–Ubon Ratchathani
: Kalasin-Phang Khon, Sakon Nakhon
: Chum Phae, Khon Kaen–Mueang Nong Bua Lamphu
: Kaeng Khro, Chaiyaphum–Mancha Khiri, Khon Kaen
Mueang Khon Kaen Ring Road
Mueang Ubon Ratchathani Ring Road
Mueang Roi Et Ring Road
: Entrance to Nong Khai
: Phetchabun Bypass Road
: Kae Bypass Road (now superseded by Route 223)
: Mukdahan Bypass Road
: Entrance to bridge over the Mekong River (Mukdahan)
: Phanom Bypass Road
: Sakon Bypass Road
: Nong Khai - Tha Bo
: Entrance to checkpoint at Nong Khai
(Mueang Buriram Ring Road)
(Mueang Nakhon Ratchasima Ring Road)
: Mahasarakham Bypass Road
: Yasothon Bypass Road
: Surin Bypass Road
: Sisaket Bypass Road
: Entrance to bridge over the Mekong River (Nakhom Phanom)
: Route 22 (Phang Khom) - Waritchaphum (now superseded by Route 227)
: Somdet, Kalasin-Mukdahan (now superseded by Route 12)
: Ben Phai - Mancha Khiri (now superseded by Route 229)
(Warirachadet Road ถนนวารีราชเดช): Yasothon Route 23-Bypass north to Amphoe Sai Mun–Kut Chum–Thai Charoen–Loeng Nok Tha–Route 2047, thence east 5 km to NS Route 212
: Chai Badan - Dan Khun Thot

Central Thailand including eastern region[]

AH1, AH2 and Thailand Route 32 in Ayutthaya

Highway 3 (Sukhumvit Road) : Bangkok–Trat as
Highway 31 (Vibhavadi Rangsit Road): Bangkok–Pathum Thani.
Highway 32 Ayutthaya–Nakhon Sawan as AH1 AH2
(Suwannasorn Road, Thai: ถนนสุวรรณศร) : Saraburi–Sa Kaeo as AH1
Highway 34 (Debaratana Road): part of the , Bangkok–Chachoengsao as AH19
Highway 35 (Rama II Road, Thai: ถนนพระราม 2): Bangkok–Pak Tho
(Pattaya-Rayong Bypass Road): Bang Lamung (Pattaya) - Rayong as
(Bypass Cha'am-Pranburi)
(Don Mueang/Uttaraphimuk tollway)
: Bang Sue (Bangkok) - Nonthaburi
Highway 302 (Rattanathibet Road): Chatuchak (Bangkok) - (Nonthaburi)
(Suksawat Road, Thai: ถนนสุขสวัสดิ์): Chom Thong-Phra Samut Chedi
Route 304: Pak Kret, Nonthaburi–Nakhon Ratchasima as AH19
: Rangsit–Nakhon Nayok
(Rama VII Road, Thai: สายพระราม 7)
: Pak Kret-Pathum Thani
: Entrance to Bang Pa-in
(Rojana Road): Sing Buri – Ang Thong, Ayutthaya, following the Chao Phraya river
: Entrance to Saraburi
(Narai Maharaj Road): Route 1, Mueang Lop Buri District – Route 1, Mueang Chai Nat District
: Route 1 to Chai Nat, designation decommissioned
: Cheang Wathhana and Raminthra road.Now part of route *
(Siri Sothon Road): Bang Pakong - Chachoengsao (Chachoengsao Province)
: Chachoengsao - Chonburi
: Route 3 – Route 3150 (Chantaburi)
: Chantaburi – Sa Kaeo
: Trat – Hat Lek (now part of Route 3)
(Suwinthawong Road): Nong Cha Om - Phanom Sarakham
(Prachin Thani Road)
(Malaiman Road): Nakhon Pathom - Mueang Suphan
Mueang Suphan - Don Chedi (Suphanburi)
: (Sangchuto Road): Ban Pong District (Ratchaburi Province) - Three Pagodas Pass, Sangkhla Buri District (Kanchanaburi Province) as
: Kanchanaburi Province – Suphan Buri Province
: Bang Phae, Ratchaburi – Mueang Samut Songkhram
: (Prachuap Khiri Khan Road): Entrance to Prachuap Khiri Khan
(Chumphon-Ranong Road, Mueang Chumphon Road): Pathomphon Intersection – Doc Lek Intersection
: Nong Khae - Suphan Buri, now part of Route 33
: Entrance to Ratchaburi
: Sattahip (Chonburi Province) – Phanom Sarakham (Chachoengsao Province)
(Sattahip Bypass Road): Sattahip (Chonburi Province) – Ban Chang (Rayong Province)
: U Thong (Suphan Buri Province) – Phayuha Khiri (Nakhon Sawan Province)
: Mueang Ang Thong – Route 309 (Ang Thong Province)
: Route 32 – Route 311 (Mueang Sing Buri District)
Highway 336 (Lat Phrao Road, Thai: ถนนลาดพร้าว): Chatuchak District - Huai Khwang - Wang Thonglang – Bang Kapi (Bangkok)
Highway 338 (Borommaratchachonnani Road): Bangkok Noi – Route 4 (Nakhon Chai Si) as
: Route 306 (Bang Sue) - Nonthaburi - Pathum Thani (designation decommissioned)
: Motorway 9/Route 345, Bang Bua Thong (Nonthaburi Province) – Route 1, Mueang Chai Nat (Chai Nat Province)
(Sirindhorn Road): Bang Phlat – Bang Kruai (Nonthaburi Province)
(Pradit Manutham Road): Khet Bang Khen Bangkok - Khet Watthana Bangkok downgraded to local road
Highway 343 (Rama IX Road): Din Daeng - Suan Luang (Bangkok), downgraded to local road
: Route 3, Mueang Chonburi (Chonburi Province) – Route 3, Klaeng (Rayong Province)
: Motorway 9/Route 340, Bang Bua Thong (Nonthaburi Province) – Route 346, Mueang Pathum Thani (Pathum Thani District)
: Route 1/Route 305, Thanyaburi (Pathum Thani Province)– Route 324, Phanom Thuan (Kanchanaburi Province)
: Mueang Phanom Thani (Pathum Thani Province) – Maha Rat District (Ayutthaya Province) as AH2
: Aranyaprathet – Nang Rong as
: Route 315, Phanat Nikhom – Route 344, Nong Chak
: Route 351, Nawamin – Route 304, Saeng Arun (Bangkok)
Route 351 (Prasoet Manukit Road, Thai: ถนนประเสริฐมนูกิจ): Chatuchak District - Bueng Kum (Bangkok)
: Route 3004, Thanyaburi (Pathum Thani Province) – Route 309, Wang Noi (Ayutthaya Province)
: Entrance to Suvarnabhumi Airport
(Ayutthaya Bypass Road): Route 32 – Route 347 (Ayutthaya)
: Suphanburi Ring Road
: Route 33, Mueang Sa Kaeo (Sa Kaeo Province) – Route 304, Phanom Sarakham (Chachoengsao Province)
: Entrance to Chumphon
: Chonburi Bypass Road
: Saraburi Ring Road
: Rayong Government Center - Map Ta Phut Industrial Estate; former Route 3514
: Rayong Bypass Road
: Chachoengsao Bypass Road
: Lopburi Bypass Road
: Kanchanaburi Bypass Road
: Ang Thong Bypass Road
: Singburi Bypass Road
(Suvarnabhumi Road 3): Entrance to Suvarnabhumi Airport
: Aranyaprathet Bypass Road
: Ban Bo - Don Tum
: Entrance to barracks at Chiraprawat
: Pak Nam Pho – Tha Ta Kui, designation decommissioned
: Route 1 – Chao Phraya River (Krok Phra), now rural road 1111
: Chiraprawat – Sap Samo Thot
: Nakhon Sawan - Krok Phra
: Entrance to Takhli Market
: Route 3265 – Thanam (Uthai Thani Province), designation decommissioned
: Phayuha Khiri - Noen Makok
: Hankha original route, designation decommissioned
: Sapphaya - Route 340, Sankhaburi
: Entrance to Nong Chang Market
: Nong Chang – Route 1072, Lat Yao
:
: Lopburi – Erawan Camp (Lopburi Province)
: Nikhom – Wang Muang intersection
:
: Khok Krathiam intersection (Route 1) – Khok Krathiam Railway Station (Lopburi Province)
: Phra Phutthabat - Nong Don (Saraburi Province)
: Entrance to Ban Mo, designation decommissioned
: Route 3020, Phra Phutthabat – Tha Ruea (Saraburi Province)
(Tha Ruea–Tha Lan Road): Tha Lan – Tha Luea, designation decommissioned
: Route 205, Ban Mi – Khao Chong Lom
: Sing Buri – In Buri District, designation decommissioned
: Route 321, Kamphaeng Saen District – Bang Len District – Lat Lum Kaeo District, combined with Route 3035 and Route 3194; now part of Route 346 except for a section in Pathum Thani Province that is still Route 3035
: Route 3095, Mueang Nakhon Pathom – intersection at Route 346, Don Tum, now part of Route 375
: Sao Hai – Nong Saeng, now part of Route 3041
: Mueang Phuket – Nong Saeng, now part of Route 3041
: Route 33, Mueang Nakhon Nayok – Nang Rong Falls (Nakhon Nayok Province)
: Entrance to Sarika Waterfall (Nakhon Nayok Province)
: Route 309 (Pridi Thamrong Bridge) – Route 32 (Ayutthaya Province), downgraded to local road
: Route 309 – U Thong Road (north side)
: Route 309 – U Thong Road (south side)
: Bang Pa-In Railway Station – Bang Pa-In, downgraded to local road
: Route 309 – Dusidaram Temple (Ayutthaya Province), downgraded to local road
: Route 309 – Phanan Choeng Temple (Ayutthaya Province), downgraded to local road
:
:
: Route 309, Wat Pun – Bang Pahan, designation decommissioned
: Bo Phong – Khok Mali
: Ang Thong – Pak Dong
: Pho Thong – Sawaeng Ha, now part of Route 3064
: Rangsit – Pratunam Chulalongkorn, designation decommissioned
: Aranyaprathet – Phai Lom
: Aranyaprathet – Lahan Sai, redesignated as Route 348
(Prachin Anuson Road): Prachin Buri - Sri Maha Phot
(Khokkha-Bua Lai Road): Prachinburi Railway Station – Khlong Khok Ka, downgraded to local road
(Siwaboon Road): Junction to Prachantakham, now local road 10-002
: Entrance to Watthana Nakhon, designation decommissioned
: Entrance to Kabinkuri, downgraded to local road
: Junction to Sa Kaeo Railway Station, downgraded to local road
: Entrance to Photharam
: Junction to Tamaka, designation decommissioned
: Junction to Pak Phraek Station, designation decommissioned
Yang Ko–Si Mongkhon
Lat Ya–Dan Chang
Ratchaburi-Cheek Ong
Ratchaburi-Wan Dao
: Khao Ngu Stone Park – Route 323 (Ratchaburi Province), now part of Route 3291
: Ban Chom - Nong Tak Ya
: (Setthakit Road 1): Motorway 35, Mueang Samut Sakhon – Route 4, Krathum Baen
: Entrance to Nakhon Chai Si
: Rachamankha - Sanam Chan, downgraded to local road
: Route 4, Phra Prathon – Route 35 (Ban Bo), now part of Route 375
: Entrance to Sam Phran, downgraded to local road
(Nonthaburi Road 1, Sanambinnam Road): Route 306 – Pak Kret Airport, combined with Route 3110
: Route 346, Rangsit – Rangsit Canal (Pathum Thani Province), now part of Route 345
(Sihaburanukit Road): Entrance to Min Buri (Bangkok), downgraded to local road
(Sanphawut Road): Bang Na – Route 3109 (Bangkok)
(Wongsawang Road): Bang Hid - Rama VI - Wat Thong Thong (Bangkok), downgraded to local road
(Nakorn Khuean Khan Road): Entrance to Phra Pradaeng, downgraded to local road
(Old Paknum Railway Road): Khlong Toei – Route 3, downgraded to local road
(Nonthaburi Road 1, Sanambinnam Road): Leam Rim Nam Municipality - Bang Kraso (Nonthaburi Province), combined with Route 3099; later redesignated as local highway 2-0017
: Route 307/Route 3035, Pathum Thani Province – Route 3263, Sena District
: Pathum Thani - Lat Lum Kaeo, combined with Route 3035; much of route now part of Route 346 except for the section from route origin to the Pathum Thani Provincial Administration Office which is still Route 3035
(Phuchao Saming Phray Road): Route 3 – Bhumibol Bridge (Mueang Samut Prakan)
(Thai Ban Road): Thai Ban – Pak Nam (Samut Prakan Province), downgraded to local road
(Sai Luat Road): Route 3 – Route 3114 (Samut Prakan Province), downgraded to local road
(Phraek Sa Road): Route 3 (Bang Ping) – Phraek Sa, downgraded to local road
(Khlong Dan-Bang Bo Road, Rattanarat Road): Route 3, Khlong Dan – Bang Na Expressway, Bang Bo (Samut Prakan Province)
(Rom Klao Road): Min Buri - Lat Krabang (Bangkok)
(Samphan Road): Lam Phak Chi - Nong Chok, downgraded to local road
: Bangkhla – Bang Nam Priao (Chachoengsao Province), designation decommissioned
: Bangpakong Intersection (Chachoengsao Province), downgraded to local road
: Route 3 – Sriracha Market (Chonburi Province), designation decommissioned
: Junction to Bang Phra Reservoir (Chonburi Province), now local road 24-007
: Bang Pla Soi Intersection (Chonburi Province), downgraded to local road
: Chonburi – Khao Bang Sai Temple (Chonburi Province), downgraded to local road
(Pattaya-Naklua Road): Route 3 – Banglamung District (Chonburi Province), now local road 2-0008
: Chonburi – Klaeng District (Chonburi Province), much of route now part of Route 344; remainder now local roads, rural route 3059 and Route 3289
(Pattaya-Naklua Road, One Pattaya Road, South Pattaya Road): Na Kluea Market – South Pattaya (Chonburi Province), downgraded to local road
(North Pattaya Road): Route 3 – North Pattaya (Chonburi Province), downgraded to local road
: Entrance to Ban Phe
: Junction to U-Tapao, designation decommissioned
:
: Entrance to Khao Kheow Open Zoo
:
(Si Bunruang Road): Hua Hin – Tha Mai (Chanthaburi Province), downgraded to local road
: Trat-Laem Ngop
:
(Tha Luang Road): Route 3 (Koh Rong) – Rin Nam Chanthaburi, downgraded to local road
: Route 3149 (Nong Chim) – Perid Island, one section now rural route 4001 and the remainder downgraded to local road
(Phraya Trang Road): Chanthaburi – Tha Mai
(Trirat Road): Trirat Bridge – Route 3 (Ploy Siam), downgraded to local road
: Tha Mi Park – Bang Kradan, now part of Route 3156
: Route 3 – Ao Kai Intersection (Rayong Province), now local highway 1-0042
: Junction to Pak Nam Prasae (Rayong Province), now local highway 10-018, 1-0032, and rural route 4036
: Junction to Khao Yoi Railway Station (Phetchaburi Province), designation decommissioned
: Entrance to Tha Sae Market
: Route 3077 (Nong Khing) – Khao Khiao (Nakhon Nayok Province), downgraded to local road
(Lat Phrao Road): Bang Sue – Bang Kapi (Bangkok), redesignated as Route 336; now a local road
(Phran Nok Road): Fai Chai Junction – Phran Nok Junction (Bangkok), downgraded to local road
: Phanom Thuan District - Phra Thaen Dong Rang - Kamphaeng Saen District, now part of Route 346
: Route 33 (Huai Chot) – Bo Ning Ching (Sa Kheo Province), now rural road 66-001
Highway 3202 (Nawamin Road, (Thai: ถนนนวมินทร์)): Bang Kapi – Khan Na Yao (Bangkok), downgraded to local road
(Chiang Rak Road, Khlong Luang Road): Route 347, Sam Khok – Rural Highway 3010, Khlong Luang (Pathum Thani Province)
(Bang Kruai-Sai Noi Road, Thai: ถนนบางกรวย-ไทรน้อย): Wat Daeng-Sai Noi
(Thep Khunakorn Road): Route 314 – Srisothon Road (Chachoengsao Province), downgraded to local road
: Route 3218 (Nong Taphao) – Pa La U (Prachuap Khiri Khan Province), now Route 3218 and rural route 2052
: Route 3017 – Khram Phran Intersection (Saraburi Province), designation decommissioned
: Route 3193 (Phakat) – O Lam Chee (Chanthaburi Province), now rural route 4031
: Tambon U Thong Sanitation Area – Ban Rai, now part of Route 333
(Ekkachai Road, Thai: ถนนเอกชัย): Samut Sakhon-Bangpakok 8 Hospital
: Route 3193 (Ban Pa) – Nong Kok (Chanthaburi Province), now rural route 4032
: Junction to Ban Laem, now rural route 4033
(King Kaew Road (Section Theparak Road-Lat Krabang Road), Thai: ถนนกิ่งแก้ว (ช่วงถนนเทพารักษ์-ถนนลาดกระบัง), (Tamru-Bang Phli Road (Section Sukhumvit Road-Theparak Road), Thai: ถนนตำหรุ-บางพลี (ช่วงถนนสุขุมวิท-ถนนเทพารักษ์): Bangpoo-King Kaew
: Nonthaburi Bridge – Route 340, now part of Route 345
: Ban Mi District – In Buri, designation decommissioned
(Theparak Road, Thai: ถนนเทพารักษ์): Samrong-Bang Bo
: Khlong Yai District – Hat Lek, became part of Route 318; now part of Route 3
: Route 3087 (Buakhao Intersection) – Route 3209 (Cheek On), now part of Route 3087
: In Buri Intersection (Sing Buri Province), downgraded to local road
(Seri Thai Road): Bang Kapi – Min Buri (Bangkok), downgraded to local road
(Jaranyanon Road): Route 34 (Bang Wua) – Route 314 (Bang Pakong), downgraded to local road
: Route 318 (Tha Sai) – Laem Klat, now a rural route
: Route 321 (Kamphaeng Saen) – Kamphaeng Saen Aviation School, designation decommissioned
: Route 309 – Ang Thong, designation decommissioned
: Route 3 (Khao Yai Chum) – Route 3145 (Suan Son), now local road 1-0016
: Route 3219 (Nong Phlap) – Yang Chum, now part of Route 3218
: Route 3198 (Nong Tao) – Wang Ri (Sa Kaeo Province), now part of rural route 4033
Route 3309 Route 346 Muang Pathum Thani,Pathum thani - Route 308,Route 3477 Bang Pa In,Phra Nakhorn Si Ayutthaya
: (Phutthamonthon Sai 4 Road, Thai: ถนนพุทธมณฑล สาย 4): Krathum Lom-Phutthamonthon
: Entrance to Khao Thong, downgraded to local road
: (Lam Luk Ka Road, Thai: ถนนลำลูกกา): Rangsit-Lam Luk Ka (Pathum Thani)
: Route 3087 (Pa Wai Chat) – Pong Krating (Ratchaburi Province), now part of Route 3206
: Route 314 – Route 3296 (Bang Phra), now local road 1-0005
: (Phutthamonthon Sai 6 Road, Thai: ถนนพุทธมณฑล สาย 6): Raikhing-Song Khanong
: Route 3 (Kachet) – Hat Yai (Rayong Province), downgraded to local road
(Thetsaban 1 Road, Phisanathumkhun Road): Route 3 (Nern Sung) – Route 3147 (Chanthaburi Province), now local highway 21-001
: Route 3313 (Suan Phueng) – Huai Suea (Ratchaburi Province), downgraded to local road
: Khao Bo Kew settlement – Hua Ngew (Nakhon Sawan Province), downgraded to local road
: Ko Pho – Route 3245 (Chonburi Province), now local road 1-1005
Highway 3344: (Srinagarindra Road, Thai: ถนนศรีนครินทร์): Bang Kapi-Samut Prakan
(Charuwar Road): Phanat Nikhom - Nong Chak (Chonburi Province), redesignated as Route 349
: Phanom Sarakham - Ban Sang, now part of Route 3076
: Dan Makham Tia - Nong Pak Dong, designation decommissioned
: Route 3247 (Khao Hom) – Route 3193 (Ban Pa), downgraded to local road
: Route 3143 – Route 3191 (Rayong Province), now local road 1-0063
: Route 3 (Khao Din) – Nong Samet (Rayong Province), now local roads 10-017 and 1-0036
: Route 3068 (Aranyaprathet) – Pa Rai (Sa Kaeo Province), combined with Route 3397, now part of rural route SS 3085
: Route 3068 (Nong Yak) – Route 3381 (Ang Sila), downgraded to local road
: Route 3068 (Nong Waeng) – Pa Rai (Sa Kaeo Province), one section became part of Route 3397, now rural route SS 3085; other section became Route 348, now rural route SK 3086
: Route 3068 (Khok Phrek) – Khok Rek, now rural road SK 3069
: Route 3367 (Khao Noi) – Route 3384 (Sai Sing), now part of Route 3366 and Route 3067
: Route 3 (Huai Pong) – Nong Fae Intersection (Rayong Province), downgraded to local road
: Route 3198 (Chong Kum) – Route 348 (Kaew Petch), now part of Route 3395
: Route 1 – Chao Phraya River (Nakhon Sawan Province), downgraded to local road
: Route 3068 (Na Ngam) – Route 3381 (Khok Sung), combined with Routes 3379 and 3381 and redesignated Route 348; now rural route 3085
: Route 3 (Nong Si Nga) – Laem Sadet (Chanthaburi Province), now rural routes 1036 and 4001
: Route 3 (Na Yai Am) – Nong Chek Soi (Chanthaburi Province), downgraded to local road
: Route 3 (Nong Khla) – Tapong (Chanthaburi Province), downgraded to local road
: Route 3 (Don Samrong) – Taeng, now rural route 1030
: Route 3253 (Don Yang) – Route 3374 (Nong Toi Tai), now part of Route 3374
: (Bang Bo Bypass Road, Thai: ถนนเลี่ยงเมืองบางบ่อ
: (Phutthamonthon Sai 5 Road, Thai: ถนนพุทธมณฑล สาย 5): Omnoi-Salaya
: (Phutthamonthon Sai 7 Road, Thai: ถนนพุทธมณฑล สาย 7): Sam Phran-Nakhon Chai Si River
: Junction to Nong Yai, downgraded to local road
: Entrance to Bang Sai, now local road 1-0044
: Junction to Bang Sai, downgraded to local road
: Route 317 (Wang Chik) – Nong Yai, now rural route SK 3008
(Ban Na Road): Route 3 – Nern U Thong, downgraded to local road
(Khao Wong Road): Route 3 (Kao Din intersection) – Route 3406 (Rayong Province), downgraded to local road
: Route 317 – Route 317 (Khao Chakan), now rural route 3087
(Sunthorn Vej Road): Route 3 (Noen Din intersection) – Noen Yong, downgraded to local road
: Route 321 – Route 3431 (Suphan Buri Province), now part of Route 321
:Route Bang pa in - Chedi Wat Sam Pluem Phai Ling
: Junction to Uthai, designation decommissioned
: Route 3249 (Khlong Plu) – Chanthak Lom (Chanthaburi Province), downgraded to local road
: Route 3462 – Route 3198 (Sa Kaeo Province), now part of Route 3462
: Route 321 – Ban Yang (Suphan Buri Province), downgraded to local road
: Khlong Son – Khlong Muang, now rural road 1036
: Entrance to Wat Kamphaeng (Ayutthaya Province), downgraded to local road
: Bang Toei – Chao Phraya River (Pathum Thani Province), downgraded to local road

Southern Thailand[]

Highway 4 (Phet Kasem Road): Bangkok–Sadao via Hat Yai
Highway 41: Chumphon–Phattalung
: Songkhla–Narathiwat
: Songkhla–Pattani
Highway 44: Krabi–Surat Thani
Highway 401: Takua Pa–Nakhon Si Thammarat
: Takua Thung - Phuket
Highway 403: Mueang Nakhon Si Thammarat - Kantang
: Mueang Trang - Andaman Sea in Palian
: Phattalung - Satun
: Klong Wa - Songkhla
: Nakhon Si Thammarat - Songkhla
: Pattani - Yala
Highway 410 (Pattani–Betong Highway): Pattani–Betong
: Krabi town route (downgraded to local road)
: Entrance to Ranong
(Lopburi Ramesuan Road): Mueang Songkhla - Route 4 (Songkhla Province)
: Krabi - Surat Thani
: Mueang Satun - Palian
: Surat Thani Airport - Surat Thani
: Trang Ring Road
: Surat Thani Ring Road
Highway 4012 : a short route between Ban Tha Pae and Nakhon Si Thammarat Town.
Highway 4054 (Padang Besar-Sadao Highway): Padang Besar–Songkhla.
Highway 4056 (Sungai Padi Road): Manang Tayo-Sungai Golok
Highway 4106 (Pattani-Betong Highway): Pattani–Betong.
Highway 4184 (Wang Prachan Road) (Sadao).

Department of Highway signage[]

Route number signs[]

DOH signs for public highways (ทางหลวง, thang luang) are white squares with a black garuda (ครุฑ khrut) centered above the route number.

Signs near the beginning of a route may display the highway's name on a white rectangle above or below the square.

Highways bypassing city centres bear the principal route number marked "Bypass" in Thai (เลี่ยงเมือง), and sometimes also in English.

Department of Rural Roads[]

DORR rural roads do not follow the regional numbering scheme, above.

Signs may be black-on-white or gold-on-blue, with a two-letter province designation prefixed to the road number. Depicted is SK. 3015, for a rural road in Songkhla Province. The rural road network measures some 35,000 km, about 82 percent of which is paved. The Department of Rural Roads of the Ministry of Transport takes care of the maintenance of all the rural roads in Thailand.^[5]

Kilometer stones[]

A kilometer zero stone in northern Thailand

Milestone as goal is lakh chai (หลักชัย); also see Lak Mueang, Lakh.

Lak or Lakh kilomet (หลักกิโลเมตร) single-carriageway kilometer stone facings display the route number on the outline of a garuda. Some kilometer stones also display the route number on top. Those located to the left of the carriageway display kilometers remaining to the road's beginning at kilometer 0. As seen on the right from the opposite lane, the kilometer stones ascend in value as one proceeds away from kilometer 0. On edges facing traffic, DOH kilometer stones usually show distances remaining to the next two towns, (amphoe seats, or provincial capitals.) Some edges, such as the one depicted to the left, have retroreflector panels. Dual carriageway kilometer stones or posts in the median strip show only the kilometer number.

DORR milestones show the kilometer number, and the edges may show distances remaining to the next two villages.
Older roads built by the Ministry of the Interior Public Works Department (กรมโยธาธิการ กระทรวงมหาดไทย) have only departmental insignia and kilometer number and do not show distances on their edges.
This type of kilometer stone is sometimes found on older rural highways built during a period of rural development several decades ago. They are marked with the Thai characters รพช, an abbreviation for Rengrat Pattana Chonabot (Thai: เร่งรัดพัฒนาชนบท) which, roughly translated, means "Rapid Rural Development".

References[]

^ Thailand Public Relations Department Transport and Communication. Retrieved October 14, 2008. Archived March 1, 2012, at the Wayback Machine
^ Paper "Privatization of Highway Infrastructure in Thailand" Bureau of Planning, Department of Highways, Thailand. Retrieved 2008-10-19. Archived July 11, 2012, at the Wayback Machine
^ DOH website, ประเภททางหลวง, retrieved on November 13, 2008 Archived December 11, 2011, at the Wayback Machine
^ Jump up to: ^a ^b ^c ^d ^e "ระบบหมายเลขทางหลวง". Department of Highways website. Department of Highways. Archived from the original on 5 October 2011. Retrieved 13 August 2011.
^ World Bank, Transport in Thailand. Retrieved October 14, 2008.

External links[]

Asian / ASEAN Highway Route Marker (21MB) Department of Highways Thai-language 18-page file, with 1 index and 8 regional maps of AH system overlaid on existing Thai national highways, plus diagrams of AH route markers. Retrieved 2008-10-14.^{[dead link]}

[1] Thailand Public Relations Department Transport and Communication. Retrieved October 14, 2008. Archived March 1, 2012, at the Wayback Machine

[2] Paper "Privatization of Highway Infrastructure in Thailand" Bureau of Planning, Department of Highways, Thailand. Retrieved 2008-10-19. Archived July 11, 2012, at the Wayback Machine

[3] DOH website, ประเภททางหลวง, retrieved on November 13, 2008 Archived December 11, 2011, at the Wayback Machine

[numbers-4] Jump up to: ^a ^b ^c ^d ^e "ระบบหมายเลขทางหลวง". Department of Highways website. Department of Highways. Archived from the original on 5 October 2011. Retrieved 13 August 2011.

[5] World Bank, Transport in Thailand. Retrieved October 14, 2008.

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