# Thai highway network

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:
* Regions
* 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:
| Name | Direction |
| Phahonyothin Road | to northern Thailand |
| Mittraphap Road | to northeastern Thailand |
| Sukhumvit Road | to eastern Thailand |
| Phetkasem Road | to southern Thailand |
The Highway number system specifies the use of 4 digits to refer to highways. By dividing highways into 4 sub-levels as follows:
* Meaning
* Two digits indicate a principal highway within a region.
* Three digits indicate a regional secondary highway.
* Four digits indicate an intra-province highway connecting a provincial capital to its districts, or between important sites.

## Highways by region
### Northern Thailand

| Route | Km | Name | Destination | Remarks | Province |
| 1-3 Digits ||||||
| 1 | 1,005 | Phahonyothin Road | Bangkok-Mae Sai Checkpoint | AH1, AH2, AH13 | 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 | AH13 | 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 | AH1, AH13, AH16 | 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 | AH12 | 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 | AH15 | 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 | AH121 | 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

| Route | Km | Name | Destination | Remarks | Province |
| 1-3 Digits ||||||
| 3 | 426.931 | Sukhumvit Road | Bangkok-Hat Laek Checkpoint | AH123 | 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 | AH1, AH2 | Ayutthaya, Ang Thong, Sing Buri, Chainat, Nakhon Sawan |
| 33 | 299.549 | Suphanburi-Pa Mok Road; Phachi-Hinkong Road; Suwannason Road | Suphanburi-Aranyaprathet Checkpoint | AH1 | Suphanburi, Ang Thong, Ayutthaya, Saraburi, Nakhon Nayok, Prachinburi, Sa Kaeo |
| 34 | 58.855 | Debaratana Road / Bang Na–Trat Road | Bang Na-Chonburi | AH19 | 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 | AH123 | 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 | AH2 | 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, Rattanathibet 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 | AH19 | 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 | | | | | |
| 336 | 0.851 | Lat Phrao Road | Entrance to Lat Phrao | Former portion of Highway 3185 | Bangkok |
| 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) ||||||
| 3001 | | | | | |
| 3002 | | | Pak Nam Pho - Tha Ta Kui | Downgraded to local highway | Nakhon Sawan |
| 3003 | | | intersection with Highway 1 - Chao Phraya River (Krok Phra) | Downgraded to Rural Road 1111 | Nakhon Sawan |
| 3004 | | | | | |
| 3005 | | | | | |
| 3006 | | | | | |
| 3007 | | | Highway 3265 - Tha Nam (Manronom) Intersection | | Nakhon Sawan |
| 3008 | | | | | |
| 3009 | | | Original route around Hankha | Now part of Highway 3211 | Chai Nat |
| 3010 | | | | | |
| 3011 | | | | | |
| 3012 | | | | | |
| 3013 | | | | | |
| 3014 | | | | | Lopburi |
| 3015 | | | | | Lopburi |
| 3016 | | | | | |
| 3017 | | | | | |
| 3018 | | | | | Lopburi |
| 3019 | | | | | |
| 3020 | | | | | |
| 3021 | | | | | Saraburi |
| 3022 | | | | | |
| 3023 | | Tha Ruea-Tha Lan Road | | | Saraburi, Ayutthaya |
| 3024 | | | | | |
| 3025 | | | Thepsatri Circle, Lopburi | | Lopburi |
| 3026 | | | Highway 205 - Khok Samrong district | | Lopburi |
| 3027 | | | | | |
| 3028 | | | | | |
| 3029 | | | Highway 1 junction (Khao Phra Ngam) - edge of military area | Downgraded to local highway 7-0002 | Lopburi |
| 3030 | | | | | |
| 3031 | | | Sing Buri - Inburi district | Now part of Highway 311 | Sing Buri |
| 3032 | | | | | |
| 3033 | | | | | |
| 3034 | | | | | |
| 3035 | | Pathum Thani-Bang Len Road, Phon Damri Road, Bang Len-Kamphaeng Saen Road | Highway 321 junction (Kamphaeng Saen district) - Bang Len district - Lat Lum Keo district | Much of route now Highway 346; remaining section from the origin to the Pathum Thani Provincial Administrative Organization intersection now a local highway | Pathum Thani, Nonthaburi, Nakhon Pathom |
| 3036 | | | Highway 3095 (Nakhon Pathom) - Highway 346 (Beng Len) | Now part of Highway 375 | Nakhon Pathom |
| 3037 | | | Suphan Buri Municipality Control Area - Highway 340 (Bang Pla Ma) | | Suphan Buri |
| 3038 | 15.945 | | Don Chedi - Sri Prachan | | Suphan Buri |
| 3039 | | | | | |
| 3040 | | | | | |
| 3041 | 29.239 | Phichai Rongrong Songkhram Road | Saraburi - Khao Krad | | Saraburi |
| 3042 | | | | | |
| 3043 | | | | | |
| 3044 | | | Sao Hai - Nong Saeng district | Now part of Highway 3041 | Saraburi |
| 3045 | | | | | |
| 3046 | | | | | |
| 3047 | | | Khao Khad - Nong Saeng district | Now part of Highway 3041 | Saraburi |
| 3048 | | | | | |
| 3049 | | | | | |
| 3050 | | | | | |
| 3051 | | | | | |
| 3052 | | | | | |
| 3053 | | | Highway 309 (Pridi Thamrong Bridge) - junction with Highway 32 | Base of Pridi Thamrong Bridge to Wat Pa Kho intersection downgraded to local highway A.T. 2-0020 Wat Pa Kho intersection to border of Ayutthaya municipality downgraded to local highway A.T. 2-0021 Ban Ko Subdistrict to Highway 32 downgraded to a local highway | Ayutthaya |
| 3054 | | | Highway 309 junction (right end) - U Thong Road (north side) | | Ayutthaya |
| 3055 | | | Highway 309 junction (left end) - U Thong Road (south side) | | Ayutthaya |
| 3056 | | | | | |
| 3057 | | | Bang Pa-in railway station - Bang Pa-in | Downgraded to local highway | Ayutthaya |
| 3058 | | | Highway 309 (Sam Pluem Temple Chedi roundabout, left side) - Dusitdharam Temple | In Ayutthaya Municipality, downgraded to local highway A.T. 4-0004 In Hanthra Subdistrict, downgraded to local highway | Ayutthaya |
| 3059 | | Chedi-Wat Yai Chai Mongkol Road | Highway 309 (Sam Pluem Temple Chedi roundabout, right side) - Wat Phanan Choeng | In Ayutthaya Municipality, downgraded to local highway A.T. 4-0001 In Ayutthaya City Municipality, downgraded to local highway A.T. 2-0020 | Ayutthaya |
| 3060 | | | Phukhaothong - Paniat | In Lumpli, downgraded to local highway A.Th 130-01 In Suan Phrik, downgraded to local highway A.Th 139-02 In Ayutthaya, downgraded to local highway A.Th 2-0019 | Ayutthaya |
| 3061 | | | | | Ayutthaya |
| 3062 | | | Highway 309 (Wat Tum) - Bang Pa-in | | Ayutthaya |
| 3063 | | | | | |
| 3064 | | | | | |
| 3065 | | | | Now part of Highway 3064 | Ang Thong |
| 3066 | | Rangsit Canal Road | Rangsit - Chulalongkorn Gate | | Pathum Thani |
| 3067 | | | | | |
| 3068 | | Thanawithi Road | Aranyaprathet - Lahansai | Renumbered to Highway 348 | Sa Kaeo, Buriram |
| 3069 | | Prachin Anusorn Road | Prachinburi - Sri Maha Phothi | Now part of Highway 3079 | Prachinburi |
| 3070 | | | | | |
| 3071 | | Prachin Anusorn Road | Prachinburi - Sri Maha Phothi | Downgraded to a local highway | Prachinburi |
| 3072 | | Sivaboon Road | Prachantakam entrance intersection | Downgraded to local highway P.C.T. 10-002 | Prachinburi |
| 3073 | | | Entrance to Watthana Nakhon City | Now part of Highway 3395 | Sa Kaeo |
| 3074 | | | Entrance to Kabin Buri | Downgraded to local highway | Prachinburi |
| 3075 | | Thesaban Road 19 | intersection to Sa Kaeo railway station | Downgraded to local highway | Sa Kaeo |
| 3076 | | | | | |
| 3077 | | | | | |
| 3078 | | | | | |
| 3079 | | | | | |
| 3080 | | | Entrance to Photharam | Now part of Highway 3090 | Ratchaburi |
| 3081 | | | | | |
| 3082 | | Old Saengchuto Road | intersection to Tha Maka | Now part of Highway 3548 | Kanchanaburi |
| 3083 | | | intersection to Pak Phraek station | | Prachinburi |
| 3084 | | | | | |
| 3085 | | | | | |
| 3086 | | | | | |
| 3087 | | | | | |
| 3088 | | | | | |
| 3089 | | Khao Ngu-Bok Phrai Road / Ban Pong-Nong Pla Mo Road / Ban Pong-Ratchaburi Road | Prachinburi - Sri Maha Phothi | Now part of Highway 3291 | Ratchaburi |
| 3090 | | | | | |
| 3091 | | | | | |
| 3092 | | | | | |
| 3093 | | | | | |
| 3094 | | | | | |
| 3095 | | Thanan Bok Road | Nakhon Pathom - control area of the Department of Army Animal Husbandry | Downgraded to local highway | Nakhon Pathom |
| 3096 | | Na Phra Road, Ratchamangkha Road Outside, Ratchamangkha Road | Rajamangala - Sanam Chan | Downgraded to local highway | Nakhon Pathom |
| 3097 | | | Highway 4 (Phra Prathon) - Highway 35 (Ban Bo) | Now part of Highway 375 | Nakhon Pathom, Samut Sakhon |
| 3098 | | | intersection to Sam Phran | Downgraded to local highway | Nakhon Pathom |
| 3099 | | Nonthaburi Road 1 / Sanambinnam Road | Highway 306 - Pak Kret Airport intersection | Absorbed into Highway 3110; now local highway 2-0017 | Nonthaburi |
| 4 Digits (31XX) ||||||
| 3100 | | Thonnasomsarang Road, Rangsit-Tiwanon Road, Rangsit-Prayurasak Canal Road | Highway 346 (Rangsit) - along the Rangsit to the Chao Phraya River | Now part of Highway 345 | Pathum Thani |
| 3101 | | Sihaburanukit Road | Minburi entrance intersection | Downgraded to local highway under control of Bangkok | Bangkok |
| 3102 | 0.07 | Sanphawut Road | Bangna - Sanphawut | | Bangkok |
| 3103 | | Ratchadaphisek Road | Bang Son - Rama 6 - Wat Sroi Thong | Downgraded to local highway under control of Bangkok | Bangkok |
| 3104 | | Nakhon Khuen Khan Road | intersection to Phra Pradaeng | Downgraded to local highway under control of Lat Lueng | Samut Prakan |
| 3105 | | | intersection to Phra Samut Chedi | Downgraded to local highway under control of Phra Samut Chedi | Samut Prakan |
| 3106 | | Pracharat Road, Line 1 | | Downgraded to local highway under control of Bangkok | Bangkok |
| 3107 | | Sukhumvit Road 71 (Pridi Banomyong), Ramkhamhaeng Road | Highway 3 (Phra Khanong) - Khlong Tan - Bang Kapi | Downgraded to local highway under control of Bangkok | Bangkok |
| 3108 | | | Suthisan - Huai Khwang - Din Daeng | Downgraded to local highway under control of Bangkok | Bangkok |
| 3109 | | Old Paknam Railway Road | Khlong Toei - Highway 3 (Chonkhenoi) | Bangkok: Downgraded to local highway under control of Bangkok Samrong Nuea: Downgraded to local highway | Bangkok, Samut Prakan |
| 3110 | | Nonthaburi Road 1 / Sanambinnam Road | | Absorbed Highway 3099; downgraded to local highway 2-0017 | Nonthaburi |
| 3111 | 35.485 | Pathum Thani-Sam Khok Road, Sam Khok-Sena Road | Pathum Thani - Sena | | Pathum Thani, Ayutthaya |
| 3112 | | Pathum Samphan Road, Pathum Thani-Lat Lum Kaeo Road | Pathum Thani - Lat Lum Kaeo | Absorbed into Highway 3035 (now Highway 346) | Pathum Thani |
| 3113 | 6.300 | Pu Chao Saming Phrai Road | Samrong - Bhumibol Bridge | | Samut Prakan |
| 3114 | | Thonnathaiban Road | Thai Ban - Pak Nam | Roundabout to Bang Pu subdistrict downgraded to local highway under control of Samut Prakan In Bang Pu, downgraded to local highway 11-002 | Samut Prakan |
| 3115 | | Sailuat Road | Sailuat | Downgraded to local highway | Samut Prakan |
| 3116 | | Phraeksa Road | Highway 3 (Bang Ping) - Phraeksa | Bang Pu: Downgraded to local highway 11-001 Phraeksa subdistrict: Downgraded to local highway 16-001 Phraeksa Mai Municipality: Downgraded to local highway | Samut Prakan |
| 3117 | 7.882 | Panawithi Road, Rattanarat Road | Khlong Dan - Bang Bo | | Samut Prakan |
| 3119 | 11.003 | Rom Klao Road | Minburi - Lat Krabang | | Bangkok |
| 3120 | | Chueam Samphan Road | Lamphakchi - Nongchok | Downgraded to local highway under control of Bangkok | Bangkok |
| 3121 | 17.813 | Bangkhla-Plangyao Road | Bangkhla - Plaengyao | | Chachoengsao |
| 3122 | | Ban Pho - Don Sinon Road / Don Sinon - Ban Pho Road | Don Sinon - Ban Pho | Now part of Highway 3304 and a local highway | Chachoengsao |
| 3123 | | | Bang Khla - Bang Nam Priao | | Chachoengsao |
| 3124 | 8.746 | | Bang Nam Priao - Bang Khanak | | Chachoengsao |
| 3125 | | Road to Bangpakong District Office / Anantaprakarn Road | Bangpakong intersection | Downgraded to local highway 8-0006 | Chachoengsao |
| 3126 | 11.163 | | Phlo Ta Luang - Saensarn | | Chonburi |
| 3127 | 16.943 | | Map Pong - Hua Phai | | Chonburi |
| 3128 | | | Highway 3 - Sriracha Market | | Chonburi |
| 3129 | | Thesaban Road 9 | intersection to Bang Phra Reservoir | Downgraded to local highway 24-007 | Chonburi |
| 3130 | | | Bang Pla Soi intersection | Downgraded to local highway | Chonburi |
| 3131 | | | Chonburi Municipality - Khao Bang Sai Temple | Downgraded to local highway | Chonburi |
| 3132 | | Pattaya-Naklua Road | Highway 3 - Bang Lamung district | Downgraded to local highway 2-0008 | Chonburi |
| 3133 | | Chonburi-Ban Bueng Road, Ban Bueng-Klaeng Road, Nong Chak-Nen Mok Road | Chonburi - Ban Bueng - Nong Chak - Pa Yup - Highway 331 - Klaeng District | Much of route now Highway 344 Ban Bueng: Downgraded to local highway 4-0002 Ban Bueng subdistrict: Downgraded to local highway Chulabhorn Rajavidyalaya School to Nong Chak Market: Downgraded to rural highway 3059 Nong Chak to Highway 344: Downgraded to local highway Ang Wian intersection to Ban Lampung: Now part of Highway 3289 Ban Lampung to Highway 344: Downgraded to local highway 1-0703 | Chonburi |
| 3134 | 7.533 | Ang Sila Road | Ang Sila - Khao Sam Muk Intersection | | Chonburi |
| 3135 | | Pattaya-Naklua Road, Pattaya Sai 1 Road, Pattaya South Road | Naklua Market - South Pattaya | Downgraded to local highways 2-0008, 2-0005 and 2-0007 | Chonburi |
| 3136 | | North Pattaya Road | Highway 3 - North Pattaya intersection | Downgraded to local highway 2-0002 | Chonburi |
| 3137 | | Bang Saen Beach Road | area of Bang Saen Resort | Downgraded to local highway | Chonburi |
| 3138 | | | | | Chonburi, Rayong |
| 3139 | | | | | |
| 3140 | | | | | |
| 3141 | | | | | Saraburi |
| 3142 | | | | | |
| 3143 | | | | | |
| 3144 | | | | | Saraburi |
| 3145 | | | | | |
| 3146 | | | | | |
| 3147 | | | | | Saraburi |
| 3148 | | | | | |
| 3149 | | | | | |
| 3150 | | | | | |
| 3151 | | | | | |
| 3152 | | | | | |
| 3153 | | | | | Ayutthaya |
| 3154 | | | | | Ayutthaya |
| 3155 | | | Highway 309 junction (left end) - U Thong Road (south side) | | Ayutthaya |
| 3156 | | | | | |
| 3157 | | | | Downgraded to local highway | Ayutthaya |
| 3158 | | | | | Ayutthaya |
| 3159 | | | | | Ayutthaya |
| 3160 | | | Phukhaothong - Paniat | In Lumpli, downgraded to local highway A.Th 130-01 In Suan Phrik, downgraded to local highway A.Th 139-02 In Ayutthaya, downgraded to local highway A.Th 2-0019 | Ayutthaya |
| 3161 | | | | | Ayutthaya |
| 3162 | | | | | Ayutthaya |
| 3163 | | | | | |
| 3164 | | | | | |
| 3165 | | | | | Ang Thong |
| 3166 | | | | | Pathum Thani |
| 3167 | | | | | |
| 3168 | | | | | Sa Kaeo, Buriram |
| 3169 | | | | | Prachinburi |
| 3170 | | | | | |
| 3171 | | | | | Prachinburi |
| 3172 | | | | | Prachinburi |
| 3173 | | | | | Sa Kaeo |
| 3174 | | | | | Prachinburi |
| 3175 | | | | | Sa Kaeo |
| 3176 | | | | | |
| 3177 | | | | | |
| 3178 | | | | | |
| 3179 | | | | | |
| 3180 | | | | | Ratchaburi |
| 3181 | | | | | |
| 3182 | | | | | Kanchanaburi |
| 3183 | | | | | Prachinburi |
| 3184 | | | | | |
| 3185 | | Lat Phrao Road | Bang Sue - Bang Kapi | Renumbered to Highway 336; now a local highway under control of Bangkok | Bangkok |
| 3186 | | | | | |
| 3187 | | | | | |
| 3188 | | | | | |
| 3188 | | Phran Nok Road | | Downgraded to local highway under control of Bangkok | Bangkok |
| 3189 | | | | | Ratchaburi |
| 3190 | | | | | |
| 3191 | | | | | |
| 3192 | | | | | |
| 3193 | | | | | |
| 3194 | | | | | |
| 3195 | | | | | Nakhon Pathom |
| 3196 | | | | | Nakhon Pathom |
| 3197 | | | | | Nakhon Pathom, Samut Sakhon |
| 3198 | | | | | Nakhon Pathom |
| 3199 | | | | | Nonthaburi |
| 4 Digits (32XX) ||||||
| 3202 | | Nawamin Road | Bang Kapi - Khan Ya Nao | Downgraded to local highway under control of Bangkok | Bangkok |
| 3278 | | Seri Thai Road | Bang Kapi - Min Buri | Downgraded to local highway under control of Bangkok | Bangkok |
| 4 Digits (33XX) ||||||
| 4 Digits (34XX) ||||||
| 4 Digits (35XX) ||||||
| 4 Digits (36XX) ||||||
| 4 Digits (37XX) ||||||
| 4 Digits (38XX) ||||||
| 4 Digits (39XX) ||||||

### Southern Thailand

| Route | Km | Name | Destination | Remarks | Province |
| 1-3 Digits ||||||
| 4 | 1270.044 | Phetkasem Road; Kanchanawanit Road | Bangkok-Sadao Checkpoint | AH2, AH123 | 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 | AH2 | Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung |
| 42 | 262.312 | Phetkasem of Pattani-Narathiwat; Ramkomut Road; Korean Road | Sadao-Su-ngai Kolok Checkpoint | AH18 | Songkhla, Pattani, Narathiwat |
| 43 | 109.152 | Asian Road; Hat Yai-Pattani Highway; Pattani Bypass Highway | Hat Yai-Yaring | AH18 | 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 | 1.2 | Nong Chik Road | Entrance to West Pattani | Former portion of Highway 42 | Pattani |
| 4297 | 1.2 | Ramkomut Road | Entrance to Ban Di | Former portion of Highway 42 | Pattani |
| 4298 | 0.571 | Ramkomut Road | Entrance to East Yaring | Former portion of Highway 42 | Pattani |
| 4299 | 0.262 | | Entrance to Cho-koyae | Former portion of Rural Road | Pattani |
| 4 Digits (43XX) ||||||
| 4300 | 1.4 | | Entrance to Yi-ngo | Original portion of Highway 42 | 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 and Highway 42 | Pattani |
| 4355 | 0.251 | Ramkomut Road | Entrance to East Pattani | Original portion of Highway 42 | Pattani |
| 4356 | 0.426 | | Entrance to North Pattani | | Pattani |
| 4357 | 0.435 | Ramkomut Road | Entrance to Krue Se Mosque | Original portion of Highway 42 | 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 and Highway 43 | 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, but follow their own system:
* Routes beginning with 1 begin from a single-digit highway
* Routes beginning with 2 begin from a two-digit highway
* Routes beginning with 3 begin from a three-digit highway
* Routes beginning with 4 begin from a four-digit highway
* Routes beginning with 5 begin from a rural highway, local highway or expressway
* Routes beginning with 6 begin from an important place (e.g a school, temple, district or sub-district)
* Routes beginning with 7 are entrance roads to the Royal Initiative Project
Signs may be black-on-white (for highway areas) or gold-on-blue (for rural highway areas), 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 kilometres (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

    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".