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 Department of Highways (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. 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. 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:

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. These regions are:

1. Northern Thailand.
2. Northeastern Thailand.
3. Central and eastern, including the upper south.
4. Southern Thailand, except the upper south.

A single digit indicates one of four highways connecting Bangkok to outlying regions:

• 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.

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.

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.

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)

Route	Km	Name	Destination	Remarks	Province
1-3 Digits
1	1,005	Phahonyothin Road	Bangkok-Mae Sai Checkpoint	AH 1, AH 2, AH 13	Bangkok, Pathum Thani, Ayutthaya, Saraburi, Nakhon Sawan, Chainat, Kamphaeng Phet, Tak, Lampang, Phayao, Chiang Mai, Chiang Rai
11	562.673	Wachirawut Damnoen Road; Super Highway Road	Inburi-Chiang Mai	AH 13	Sing Buri, Nakhon Sawan, Phichit, Phitsanulok, Uttaradit, Phrae, Lampang, Lamphun, Chiang Mai
12	793.391	Charoenwithithong Road; Singhawat Road; Mittraphap Road; Maliwan Road; Srichan Road; Thinanon Road	Mae Sot Checkpoint-Mukdahan	AH 1, AH 13, AH 16	Tak, Sukhothai, Phitsanulok, Phetchabun, Chaiyaphum, Khon Kaen, Kalasin, Roi Et, Mukdahan
101	505.853	Charoenwithithong Road; Yantrakitkoson Road	Kamphaeng Phet - Huai Kon/Blue Permanent Border Crossing (Thai/Laos Border)		Kamphaeng Phet, Sukhothai, Phrae, Nan
110		Phahonyothin Road	Chiang Rai - Mae Sai (border)	Now a portion of Highway 1	Chiang Rai
112			Khao Sai - Wang Thong	Now a portion of Highway 11 Number reused for Kamphaeng Phet bypass	Phichit, Phitsanulok
119		Phadwaree Road	Entrance to Uttaradit intersection	Now a portion of Highway 102 Number reused for San Pa Tong - Hang Dong bypass	Uttaradit
4 Digits (10XX)
1001	93.657		Chiang Mai-Phrao		Chiang Mai
4 Digits (11XX)
1100	6.05		Entrance to Doi Kiew Ruesi		Phrae
4 Digits (12XX)
1200
4 Digits (13XX)
1300	12.049		Khamang-Pho Prathap Chang		Phichit
4 Digits (14XX)
1400	4.829		Entrance to Pa Mamuang		Tak

Northeastern Thailand

Route	Km	Name	Destination	Remarks	Province
1-3 Digits
2	495.409	Mittraphap Road	Saraburi-Nong Khai Checkpoint	AH 12	Saraburi, Nakhon Ratchasima, Khon Kaen, Udon Thani, Nong Khai
21	412.874	Saraburi - Lom Sak Road; Lom Sak - Loei Road; Kotchaseni Road; Samakkhi Chai Road	Chaloem Phra Kiat-Loei		Saraburi, Lopburi, Phetchabun, Loei
22	239.171	Nittayo Road	Udon Thani-Nakhon Phanom	AH 15	Udon Thani, Sakon Nakhon, Nakhon Phanom
23	278.752	Chaengsanit Road	Ban Phai-Ubon Ratchathani		Khon Kaen, Maha Sarakham, Roi Et, Yasothon, Ubon Ratchathani
24	420.145	Sathon Mark Road	Sikhio-Ubon Ratchathani	AH 121	Nakhon Ratchasima, Buriram, Surin, Sisaket, Ubon Ratchathani
4 Digits (20XX)
2001		Bung Nam Tao-Tham Phra Road	Entrance to Ban Tham Phra	Downgraded to local highway in under control of Phetchabun Provincial Administration Organization	Phetchabun
4 Digits (21XX)
2100		Tubkob-Kokdu Road	Tubkob-Kokdu	Downgraded to Rural Road LY.4014	Loei
4 Digits (22XX)
2200		Prangku-Kammaet Road	Prangku-Kammaet	Downgraded to Local Highway with control from Prangku Subdistrict Administration Organization	Sisaket
4 Digits (23XX)
2300	30.337		Nong Nae-Nong Khuan		Mahasarakham
4 Digits (24XX)
2400	45.601	Old R.P.C Highway	Nong Hin-Erawan		Loei, Nong Bua Lamphu
4 Digits (26XX)
2601	21.242	Motorway 6 Frontage Road	Service road on the left side of Motorway 6 Bang Pa-in - Nong Khai		Nakhon Ratchasima
2602	14.197	Motorway 6 Frontage Road	Service road on the right side of Motorway 6 Bang Pa-in - Nong Khai		Nakhon Ratchasima

Central, western and eastern Thailand

AH1, AH2 and Highway 32 in Ayutthaya

Route	Km	Name	Destination	Remarks	Province
1-3 Digits
3	426.931	Sukhumvit Road	Bangkok-Hat Laek Checkpoint	AH 123	Bangkok, Samut Prakan, Chachoengsao, Chonburi, Rayong, Trat
31	23.510	Vibhavadi Rangsit Road	Din Daeng-Don Mueang		Bangkok, Pathum Thani
32	150.545	Asian Road	Bang Pa-in-Manorom	AH 1, AH 2	Ayutthaya, Ang Thong, Sing Buri, Chainat, Nakhon Sawan
33	299.549	Suphanburi-Pa Mok Road; Phachi-Hinkong Road; Suwannason Road	Suphanburi-Aranyaprathet Checkpoint	AH 1	Suphanburi, Ang Thong, Ayutthaya, Saraburi, Nakhon Nayok, Prachinburi, Sa Kaeo
34	58.855	Debaratana Road / Bang Na–Trat Road	Bang Na-Chonburi	AH 19	Bangkok, Samut Prakan, Chachoengsao, Chonburi
35	84.041	Rama II Road	Chom Thong-Pak Tho		Bangkok, Samut Sakhon, Samut Songkhram, Ratchaburi
36	57.021	Pattaya-Rayong Bypass Highway	Bang Lamung-Rayong	AH 123	Chonburi, Rayong
36		Chonburi-Pattaya Bypass Highway	Nong Mai Daeng Interchange - Pattaya Interchange (Pong)	Nong Mai Daeng Interchange - Bangsaen Beach Intersection section now part of Highway 361 Bangsaen Interchange - Pattaya Klang Intersection section now part of Motorway 7	Chonburi
37	47.468	Cha-am-Pranburi Bypass Road; Phetkasem Road	Cha-am-Pranburi	AH 2	Phetchaburi, Prachuap Khiri Khan
37		Bangkok Outer Ring Road (West)	Bang Khun Thian - Bang Pa-in	Now part of Motorway 9 (Kanchanaphisek Road, west side)	Bangkok, Nonthaburi, Pathum Thani, Ayutthaya
38	7.327	Uttaraphimuk elevated road	Memorial Elevated Walkway - Rangsit		Bangkok, Pathum Thani
301	1.741	Bangkok-Nonthaburi Road	Khlong Bang Khen - Tiwanon		Nonthaburi
302	17.27	Ngamwongwan Road, Ratchadaphisek Road	Kasetsart University Intersection - Bangyai Interchange		Bangkok, Nonthaburi
303	15.269	Suk Sawat Road	Rat Burana - Phra Samut Chedi		Bangkok, Samut Prakan
304	294.065	Chaeng Watthana Road, Ram Inthra Road, Suwinthawong Road, Mahachakkraphat Road, Sukprayoon Road, Chachoengsao-Kabin Buri Road, Kabin Buri-Pak Thong Chai Road, Suebsiri Road	Pak Kret - Nakhon Ratchasima Overpass	AH 19	Nonthaburi, Bangkok, Chachoengsao, Prachinburi, Nakhon Ratchasima
305	74.811	Rangsit-Nakhon Nayok Road (Pathum Thani Province), Nakhon Nayok-Rangsit Road (Nakhon Nayok Province)	Rangsit - Nakhon Nayok		Pathum Thani, Nakhon Nayok
306	26.424	Pibulsongkram Road, Pracharat Road, Tiwanon Road	Rama 7 - Bang Phun		Bangkok, Nonthaburi, Pathum Thani
306		Charan Sanit Wong Road	Tha Phra - Rangsit Intersection	Downgraded to a local highway under control of Bangkok	Bangkok
307	10.813	Nonthaburi-Pathum Thani Road / Bangkok-Pathum Thani Road / Pathumthani-Krungthep Road / Pathum Thani Outer Road	Suan Somdet Intersection - Pathum Wilai Intersection		Nonthaburi, Pathum Thani
308	6.55	Udomsorayuth Road	Entrance to Bang Pa-in		Ayutthaya
309	92.828	Rojana Road, Ayutthaya-Ang Thong Road, Ang Thong-Sing Buri Road	Wang Noi - Sing Buri		Ayutthaya, Ang Thong, Sing Buri
310	1.975		Entrance to Phra Phutthabat Saraburi		Saraburi
311	75.490	Narai Maharat Road, Lopburi-Chainat Road	Lopburi - Chainat		Lopburi, Sing Buri, Chai Nat
312		Wongto Road	intersection with Highway 1 - Chai Nat province	Now part of Highway 3521	Chai Nat
313		Thasung Road	Uthai Thani - Manarom - Highway 1 intersection	Now part of Highway 3265	Uthai Thani, Chai Nat
314
315
316
317
318		Trat-Klong Yai Road, Trat-Hat Lek Road	Trat - Hat Lek	Now part of Highway 3	Trat
319
320
321
322
323
324
325
326
327
329		Phachi-Hin Kong Road, Suphan Buri-Pa Mok Road	Highway 1 junction (Hin Kong) - Highway 340 (Suphan Buri)	Now part of Highway 33	Saraburi, Ayutthaya, Ang Thong, Suphan Buri
330
331
332
333
334
335
338	31.419	Borommaratchachonnani Road	Arun Amarin - Nakhon Chai Si		Bangkok, Nakhon Pathom
339			Highway 306 intersection (Bang O) - Nonthaburi Bridge - Pathum Thani	Now part of Highway 307	Nonthaburi, Pathum Thani
340	164.210	Bang Bua Thong–Suphan Buri Road, Suphan Buri–Chai Nat Road	Bang Bua Thong - Chainat		Nonthaburi, Pathum Thani, Ayutthaya, Suphan Buri, Chai Nat
340		Rama II Road - Taling Chan, Taling Chan Road - Suphan Buri	Bang Khun Thian - Bang Bua Thong	Became part of Highway 37 (now Motorway 9) Kilometer zero moved to Bang Bua Thong interchange	Bangkok, Nonthaburi
341
343		Rama IX Road (new section)	Khlong Tan - Lat Krabang	Downgraded to local highway under control of Bangkok	Bangkok
344
345
346
347
348
349
350
351
352
354
356
357
359
360
361
362
363
364
365
366
367
368
369
370
372
375
376
377
4 Digits (30XX)
4 Digits (31XX)
4 Digits (32XX)
4 Digits (33XX)
4 Digits (34XX)
4 Digits (35XX)
4 Digits (36XX)
4 Digits (37XX)
4 Digits (38XX)
4 Digits (39XX)

Southern Thailand

Highway 43 in Pattani Province

Route	Km	Name	Destination	Remarks	Province
1-3 Digits
4	1270.044	Phetkasem Road; Kanchanawanit Road	Bangkok-Sadao Checkpoint	AH 2, AH 123	Bangkok, Nakhon Pathom, Samut Sakhon, Ratchaburi, Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Krabi, Trang, Phatthalung, Songkhla
41	382.616	Asian Road	Chumphon-Phatthalung	AH 2	Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung
42	262.312	Phetkasem of Pattani-Narathiwat; Ramkomut Road; Korean Road	Sadao-Su-ngai Kolok Checkpoint	AH 18	Songkhla, Pattani, Narathiwat
43	107	Asian Road; Hat Yai-Pattani Highway; Pattani Bypass Highway	Hat Yai-Yaring	AH 18	Songkhla, Pattani
44	133.172	Southern Road	Ao Luek-Kanchanadit		Krabi, Surat Thani
401	282.963	Tharathibodi Road; Sriwichai Road; Talat Mai Road; Kanchanawithi Road; Pattanakan Khu Khwang Road; Road around Vajiravudh Camp	Takua Pa-Nakhon Si Thammarat		Phang Nga, Surat Thani, Nakhon Si Thammarat
402	48.958	Thepkrasattri Road	Takua Thung-Phuket		Phang Nga, Phuket
403	118.888	Kantang Road	Nakhon Si Thammarat-Kantang		Nakhon Si Thammarat, Trang
404	133.663		Trang-Chalung	Originally position was Trang-Palian, now Highway 416 merged to Highway 404	Trang-Satun
405		Ron Phibun-Phatthalung Road	Ron Phibun-Phatthalung	Part of Highway 41	Nakhon Si Thammarat, Phatthalung
406	99.890	Yontrakankamthon Road; Satun Thani Road; Sulkanukun Road	Khuan Niang-Tammalang Pier		Songkhla, Satun
407	21.060	Kanchanawanit Road; Saiburi Road	Khlong Wa-Songkhla		Songkhla
408	245.159		Nakhon Si Thammarat-Ban Prakop Checkpoint		Nakhon Si Thammarat, Songkhla
409	34.759	Thesaban 1 Road (Yala)	Naket-Yala		Pattani, Yala
410	163.776	Yarang Road; Sirorot Road; Sukhyang Road	Pattani-Betong Checkpoint		Pattani, Yala
411		Uttarakit Road	Main Entrance to Krabi	Downgraded to Local Highway with under control of Krabi Provincial Administration Organization	Krabi
412	0.233		Entrance to Ranong		Ranong
413	5.29	Khokkloy Bypass Road	Tonsae-Thungpho	Downgraded to 4 digit highway/Part of Highway 4303	Phang Nga
414	24.315	Lopburi Ramesuan Road	Nam Krachai-Tha Thon		Songkhla
415	48.161		Na Nuea, Phanom		Krabi, Surat Thani
416		Palian-Chalung Road	Palian-Chalung	Part of Highway 404	Trang, Satun
417	11.296		Surat Thani Airport-Kholang		Surat Thani
418	35.649	Yarang Bypass Highway	Pattani-Thasap		Pattani, Yala
419	31.255	Trang Ring Road	Ring road around Trang city		Trang
420	31.702	Bang Bai Mai Road; Surat Thani Bypass Road (Tha Kup Intersection - Bang Kung Intersection); Surat Thani Ring Road	Ring road around Surat Thani city		Surat Thani
421	10.517	Wisetmayura Road; Satun Bypass Road	Kanae-Satun		Satun
425	7.183	Southeast Hat Yai Bypass Road	Ban Phru-Hat Yai International Airport	Under planned	Songkhla
4 Digits (40XX)
4001	6.135		Chumphon-Thayang		Chumphon
4002	7.583		Lang Suan - Pak Nam Lang Suan		Chumphon
4003	14.012		Sawi - Bokha		Chumphon
4004		Ruangrat Road	Mueang Ranong - Pak Nam Ranong	Downgraded to local highway	Ranong
4005			Mueang Ranong - Hat Sompaen	Downgraded to local highway	Ranong
4006	68.1		Ratchakrut - Lang Suan		Ranong, Chumphon
4007		Donnok Road	Entrance to Donnok Airport Intersection	Downgraded to local highway	Suratthani
4008	2.002	Tharathibodi Road	Thakham - Km.0 Intersection		Suratthani
4009	146.568	Chan Kasem Road; Poolsiri Road; Vibhavadi Rangsit Road; Surat Thani - Na San Road; Khlong Ha Road; Phra Saeng - Ao Luek Road	Mueang Suratthani - Ao Luek		Suratthani, Krabi
4010	27.55		Kanchanadit - Kham Son		Suratthani
4011	9.004	Raksankit Road	Choeng Samo - Phum Riang		Suratthani
4012	8.832		Huasai-Phraek Mueang	Originally in Mueang Nakhon Si Thanmarat, now moved farther than Mueang Nakhon Si Thammarat	Nakhon Si Thammarat
4013	68.663		Mueang Nakhon Si Thammarat - Hua Sai		Nakhon Si Thammarat
4014	17.53		Khlong Leng - Khanom		Nakhon Si Thammarat
4015	113.717	Karom Road; Ban Song-Nakhon Si Thammarat Road	Ban Tan - Ban Song		Nakhon Si Thammarat, Suratthani
4016	31.208	Karom Road (Nakhon Si Thammarat-Ban Tan section); Nakhon Si Thammarat-Phrom Khiri Road	Mueang Nakhon Si Thammarat - Nopphitam		Nakhon Si Thammarat
4017			Mueang Nakhon Si Thammarat - Ranot	Part of Highway 408	Nakhon Si Thammarat, Songkhla
4018	36.791		Thungpo - Pho Thong		Nakhon Si Thammarat, Phatthalung
4019	27.171		Thung Yai - Chang Klang		Nakhon Si Thammarat
4020	1.642	Wichitsongkhram Road	Mueang Phuket - Patong		Phuket
4021	6.473	Chaofa East Road	Mueang Phuket - Chalong Intersection		Phuket
4022	0.488		Wichitsongkhram School - Surakul Stadium		Phuket
4023	8.77	Sakdidet Road	Mueang Phuket - Cape Panwa		Phuket
4024	22.72	Chaloem Phrakiat Road; Chao Fa West Road; Wises Road	Bang Khu - Rawai Beach		Phuket
4025	6.95	Srisunthon Road	Tha Ruea - Choeng Talae		Phuket
4026	4.13		Entrance to Phuket International Airport		Phuket
4027	19.538		Tha Ruea - Mueang Mai		Phuket
4028	8.608	Patak Road	Chalong - Karon Intersection		Phuket
4029	3.236	Phrabarami Road	Kathu - Patong		Phuket
4030	40.540	Don Jom Tao Road; Ban Don - Choeng Talae Road; Srisunthon Road; Thawewong Road; Sirirat Road; Karon Road; Kata Road; Kata-Sai Yuan Road	Thalang - Rawai Beach		Phuket
4031	13.093	Old Airport Road; Thepkrasattri-Naiyang Road	Mud Dok Khao - Phuket International Airport		Phuket
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054	10.439	Padang Besa Road	Sadao-Padang Besar Checkpoint		Songkhla
4055	64.305	Ra-ngae Makha Road	Narathiwat-Sukhirin		Narathiwat
4056	53.238	Su-ngai Padi Road	Narathiwat-Su-ngai Kolok		Narathiwat
4057	25.517	Charoen Khet Road	Su-ngai Kolok-Buketa Checkpoint	Originally was Tak Bai-Buketa, now part of Highway 42 on Tak Bai-Su-ngai Kolok section	Narathiwat
4058	31.386	Makhapinnit Road	Yi-ngo-Rueso		Narathiwat
4059			Entrance to Ranong Pier	Removed/Unknown	Ranong
4060	50.833	Ratrat Phatthana Road	Saiburi-Si Sakhon		Pattani, Yala, Narathiwat
4061	36.842	Lamyai 2 Road; Yarang-Panare Highway	Yarang-Panare		Pattani
4062	41.162		Buketa-Sukhirin	Originally was in Betong-17 Km House, now part of Highway 4326 and Highway 4062 rerouted to Buketa-Sukhirin road	Narathiwat
4063	9.917		Paramitae-Ban Kotabaru		Yala
4064		Sirorot Road	Yala Hospital-Paramitae	Downgraded to Local Highway with under control of Yala Provincial Administration Organization; Melayu Bangkok-Paramitae section is part of Highway 410	Yala
4065	10.76		Ban Niang-Yaha		Yala
4066	54.679		Hutae Huwo-Ban Kotabaru		Narathiwat, Yala
4067	28.081		Ban Kotabaru-Rueso		Yala, Narathiwat
4068	6.258		Lammai-Lamphaya		Yala
4069			Asen-Tachi	Designation decommissioned	Yala
4070	29.733		Yaha-Bala		Yala
4071	24.16		Ban Kotabaru-Phiten		Yala, Pattani
4072			Na Pradu-Sai Khao Waterfall	Downgraded to Rural Road PN.3060	Pattani
4073				Unknown
4074	16.1		Trobon-Paku		Pattani
4075	7		Tolang-Ban Nok		Pattani
4076	1.5		Paku-Ban Sai Khao		Pattani
4077	32.079		Yaha-Bannang Sata		Yala
4078			Chalung-Palian	Originally was part of Highway 416, now part of Highway 404	Satun, Trang
4079		Talat Lang Road	Surat Thani-Bang Kung	Downgraded to Local Highway	Surat Thani
4080		Chaloem Phrakiat Road	Entrance to Ranong Municipality Control Area		Ranong
4081	16.15		Tha Nangphrom-Chongkae		Phatthalung
4082	11.335	Witunuthit 1 Road	Yala-Tohpakae		Yala
4083	2.887		Entrance to Ranot		Songkhla
4084	14.173	Chaturongrasamee Road	Entrance to Narathiwat	Originally Pattani-Tak Bai, now part of Highway 42 and Tak Bai entrance is part of Highway 4327	Narathiwat
4085	49.47		Pak Nam Thepha-Bannang Dama		Songkhla, Yala
4086	0.28		Entrance to Chana	Originally was Chana-Don Yang, now part of Highway 43	Songkhla
4087			Entrance to Khuan Mit Intersection	Downgraded to Local Highway with under control of Songkhla Provincial Administration Organization	Songkhla
4088			Entrance to Hanthao Train Station Intersection	Downgraded to Local Highway	Phatthalung
4089	1.825	Thasap Road	Entrance to West Yala		Yala
4090	43.466		Noppring-Hin Dan		Phang Nga
4091	71.858		Ranong-Thung Tako		Ranong, Chumphon
4092	32		Raman-Mayo		Yala, Pattani
4093			Bannang Dama-Bannang Sata	Unknown	Yala
4094	30.341		Bolo-Paknang		Nakhon Si Thammarat
4095	20.671		Saba Yoi-Khao Daeng		Songkhla
4096			Khao Peep-Paknam Tako	Downgraded to Rural Road CP.2063	Chumphon
4097			Lang Suan-Bang Nam Chip	Designation decommissioned	Chumphon
4098	7.15		Khao Mathri-Sairi Beach		Chumphon
4099	6.5		Khao Muang-Wat Laem Sai		Chumphon
4 Digits (41XX)
4100	10.669		Entrance to Khiri Rat Nikhom		Surat Thani
4101
4102
4103
4104
4105
4106
4107	11.552		Maruebo Tok-Tanyong Mas		Narathiwat
4108
4109
4110
4111	0.075	Sulakanukun Road	Entrance to Koh Nok Pier	Originally was Khuan Niang-Koh Nok Pier, now Khuan Niang-Koh Nok intersection is part of Highway 406	Satun
4112
4113	2.85		Entrance to Ban Prakob	Originally was Na Thawi-Ban Prakob, now part of Highway 408	Songkhla
4114
4115	16.67		Sukhirin-Waeng		Narathiwat
4116
4117			Rattaphum-Khlong Ngae	Designation decommissioned	Songkhla
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131			Hat Yai-Chana	Part of Highway 43	Songkhla
4132
4133
4134
4135	10.187	Airport Road	Entrance to Hat Yai International Airport		Songkhla
4136	19.097	Khok Khian Road	Kodo-Narathiwat	Chomwiw-Pamai section is part of Highway 4337	Narathiwat, Pattani
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155	10.896		Bacho-Ban Thon		Narathiwat
4156
4157	27.25	Thasedet Road; Pattani Coastal Highway	Lahan-Panare	Originally was Lahan-Talokapor, now removed due to heavy wave damages	Pattani
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167	12.076		Pamai-Tonsai		Pattani-Narathiwat
4168	8.105		Tonsai-Talodueraman		Narathiwat, Pattani
4169
4170
4171
4172
4173
4174
4175
4176	14.678		Patae-Bala		Yala
4177
4178
4179
4180
4181
4182
4183	0.156		Entrance to Satun Customs House		Satun
4184	21.85	Wang Prachan Road	Khuan Don-Wang Prachan Checkpoint		Satun
4185
4186
4187
4188
4189
4190
4191
4192
4193	21.834	Tokweng 2 Road	Su-ngai Padi-Bueloh Intersection	Originally was Su-ngai Padi-Ban Samyaek, now Highway 4057 rerouted to Bueloh intersection	Narathiwat
4194
4195
4196
4197
4198
4199
4 Digits (42XX)
4200	2.X	Watchara Road	Entrance to West Krabi	Downgraded to local highway	Krabi
4201
4202
4203
4204
4205
4206
4207	25.34		Sukhirin-Tomo		Narathiwat
4208	6.225		Entrance to Bang Klam Railway Station		Songkhla
4209
4210			Entrance to Pattani Pier	Downgraded to Local Highway with under control from Pattani Provincial Administration Organization	Pattani
4211
4212
4213
4214
4215
4216	5.911		Entrance to Thaksin Ratchaniwet Palace		Narathiwat
4217	22.676		Dusongnyo-Ai-tako		Narathiwat
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241	15.853		Sukhirin-Ai-tako		Narathiwat
4242
4243	40.01	Phichai Songkhram Road	Sadao-Ban Sathon		Songkhla
4244	21.781		Betong Checkpoint-Ban Saho		Yala
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266	13.373		Sako-Kia		Narathiwat
4267
4268
4269
4270
4271	42.48		Si Sakhon-Ai-tako		Narathiwat
4272	19.35		Yuenang-Khlong Ching		Yala
4273	33.425		Taling Chan-Si Sakhon		Yala, Narathiwat
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296	2	Nong Chik Road	Entrance to West Pattani		Pattani
4297	1.2	Ramkomut Road	Entrance to Ban Di		Pattani
4298	0.571	Ramkomut Road	Entrance to East Yaring		Pattani
4299	0.262		Entrance to Cho-koyae		Pattani
4 Digits (43XX)
4300	1.4		Entrance to Yi-ngo	Original portion of Highway 4084	Narathiwat
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321	3.127		Manang Tayo-Khoksumu	Former position of Highway 4056	Narathiwat
4322	5.527		Entrance to Cho-airong	Former position of Highway 4056	Narathiwat
4323	1.103		Entrance to East Su-ngai Padi	Former position of Highway 4056	Narathiwat
4324	0.173		Entrance to Panare	Former position of Highway 4061	Pattani
4325	21.95		Pakbang-Chulabhorn Development Village 10		Yala
4326	27.625	Rattanakit Road	Betong-17 Km House	Former route of Highway 4062	Yala
4327	6.46		Entrance to Tak Bai	Former position of Highway 4084	Narathiwat
4328	3.532		Hua Khao-Khao Tanyong	Former position of Highway 4084	Narathiwat
4329
4330
4331
4332
4333
4334	1.559		Entrance to Bang Ma Ruat	Former position of Highway 4157	Pattani
4335	0.226		Entrance to Khae Khae Beach		Pattani
4336	0.47		Entrance to Chomwiw Beach		Pattani
4337	1.355		Pamai-Chomwiw Intersection	Former position of Highway 4136	Pattani
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354	0.064	Nong Chik Road	Entrance to Don Rak	Former position of Highway 4296	Pattani
4355	0.251	Ramkomut Road	Entrance to East Pattani	Original portion of Highway 4084	Pattani
4356	0.426		Entrance to North Pattani		Pattani
4357	0.435	Ramkomut Road	Entrance to Krue Se Mosque	Original portion of Highway 4084	Pattani
4358	0.12		Entrance to Buecho		Pattani
4359	0.12		Entrance to Bang Pu		Pattani
4360
4361
4362
4363	11.058	Sukyang Road	Khoyae - Kato	Former portion of Highway 410	Yala
4364	0.72		Entrance to Buketa	Former position of Highway 4057	Narathiwat
4365
4366
4367
4368	3.328		Mai Fat-Sam Yaek	Former position of Highway 4057	Narathiwat
4369	5.496		Entrance to 2nd Sadao Checkpoint		Songkhla
4370	0.42		Entrance to Sakom Pakbang	Original portion of Highway 4086	Songkhla
4371	8.959		Sam Yaek-Yong Star	Former position of Highway 404	Trang
4372	0.495		Entrance to Wang Yao		Prachuap Khiri Khan
4373	13.378		Nong Hin - Singkhon Checkpoint	Used to be Rural Road PK.1039	Prachuap Khiri Khan

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 kilometers (22,000 mi), 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.

Kilometer stones

A kilometer zero stone in northern Thailand

Main article: Milestone

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".

See also

• Thai motorway network
• Road signs in Thailand
• List of motor vehicle deaths in Thailand by year

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.