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.[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.

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

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:

  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:[4]

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)

Northeastern Thailand

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
  • Highway 33 (Suwannasorn Road, Thai: ถนนสุวรรณศร) : Saraburi–Sa Kaeo as
  • Highway 34 (Debaratana Road): part of the Bang Na-Trat highway, Bangkok–Chachoengsao as
  • Highway 35 (Rama II Road, Thai: ถนนพระราม 2): Bangkok–Pak Tho
  • Highway 36 (Pattaya-Rayong Bypass Road): Bang Lamung (Pattaya) - Rayong as
  • Highway 37 (Bypass Cha'am-Pranburi)
  • Highway 38 (Don Mueang/Uttaraphimuk tollway)
  • Route 301: Bang Sue (Bangkok) - Nonthaburi
  • Highway 302 (Rattanathibet Road): Chatuchak (Bangkok) - Bang Yai (Nonthaburi)
  • Route 303 (Suksawat Road, Thai: ถนนสุขสวัสดิ์): Chom Thong-Phra Samut Chedi
  • Route 304: Pak Kret, Nonthaburi–Nakhon Ratchasima as
  • Route 305: Rangsit–Nakhon Nayok
  • Route 306 (Rama VII Road, Thai: สายพระราม 7)
  • Route 307: Pak Kret-Pathum Thani
  • Route 308: Entrance to Bang Pa-in
  • Route 309 (Rojana Road): Sing Buri – Ang Thong, Ayutthaya, following the Chao Phraya river
  • Route 310: Entrance to Saraburi
  • Route 311 (Narai Maharaj Road): Route 1, Mueang Lop Buri District – Route 1, Mueang Chai Nat District
  • Route 312: Route 1 to Chai Nat, designation decommissioned
  • Route 313: Cheang Wathhana and Raminthra road.Now part of route *
  • Route 314 (Siri Sothon Road): Bang Pakong - Chachoengsao (Chachoengsao Province)
  • Route 315: Chachoengsao - Chonburi
  • Route 316: Route 3 – Route 3150 (Chantaburi)
  • Route 317: Chantaburi – Sa Kaeo
  • Route 318: Trat – Hat Lek (now part of Route 3)
  • Route 319 (Suwinthawong Road): Nong Cha Om - Phanom Sarakham
  • Route 320 (Prachin Thani Road)
  • Route 321 (Malaiman Road): Nakhon Pathom - Mueang Suphan
  • Route 322 Mueang Suphan - Don Chedi (Suphanburi)
  • Route 323: (Sangchuto Road): Ban Pong District (Ratchaburi Province) - Three Pagodas Pass, Sangkhla Buri District (Kanchanaburi Province) as
  • Route 324: Kanchanaburi Province – Suphan Buri Province
  • Route 325: Bang Phae, Ratchaburi – Mueang Samut Songkhram
  • Route 326: (Prachuap Khiri Khan Road): Entrance to Prachuap Khiri Khan
  • Route 327 (Chumphon-Ranong Road, Mueang Chumphon Road): Pathomphon Intersection – Doc Lek Intersection
  • Route 329: Nong Khae - Suphan Buri, now part of Route 33
  • Route 330: Entrance to Ratchaburi
  • Route 331: Sattahip (Chonburi Province) – Phanom Sarakham (Chachoengsao Province)
  • Route 332 (Sattahip Bypass Road): Sattahip (Chonburi Province) – Ban Chang (Rayong Province)
  • Route 333: U Thong (Suphan Buri Province) – Phayuha Khiri (Nakhon Sawan Province)
  • Route 334: Mueang Ang Thong – Route 309 (Ang Thong Province)
  • Route 335: 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 339: Route 306 (Bang Sue) - Nonthaburi - Pathum Thani (designation decommissioned)
  • Route 340: Motorway 9/Route 345, Bang Bua Thong (Nonthaburi Province) – Route 1, Mueang Chai Nat (Chai Nat Province)
  • Route 341 (Sirindhorn Road): Bang Phlat – Bang Kruai (Nonthaburi Province)
  • Route 342 (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 344: Route 3, Mueang Chonburi (Chonburi Province) – Route 3, Klaeng (Rayong Province)
  • Route 345: Motorway 9/Route 340, Bang Bua Thong (Nonthaburi Province) – Route 346, Mueang Pathum Thani (Pathum Thani District)
  • Route 346: Route 1/Route 305, Thanyaburi (Pathum Thani Province)– Route 324, Phanom Thuan (Kanchanaburi Province)
  • Route 347: Mueang Phanom Thani (Pathum Thani Province) – Maha Rat District (Ayutthaya Province) as
  • Route 348: Aranyaprathet – Nang Rong as
  • Route 349: Route 315, Phanat Nikhom – Route 344, Nong Chak
  • Route 350: Route 351, Nawamin – Route 304, Saeng Arun (Bangkok)
  • Route 351 (Prasoet Manukit Road, Thai: ถนนประเสริฐมนูกิจ): Chatuchak District - Bueng Kum (Bangkok)
  • Route 352: Route 3004, Thanyaburi (Pathum Thani Province) – Route 309, Wang Noi (Ayutthaya Province)
  • Route 354: Entrance to Suvarnabhumi Airport
  • Route 356 (Ayutthaya Bypass Road): Route 32 – Route 347 (Ayutthaya)
  • Route 357: Suphanburi Ring Road
  • Route 359: Route 33, Mueang Sa Kaeo (Sa Kaeo Province) – Route 304, Phanom Sarakham (Chachoengsao Province)
  • Route 360: Entrance to Chumphon
  • Route 361: Chonburi Bypass Road
  • Route 362: Saraburi Ring Road
  • Route 363: Rayong Government Center - Map Ta Phut Industrial Estate; former Route 3514
  • Route 364: Rayong Bypass Road
  • Route 365: Chachoengsao Bypass Road
  • Route 366: Lopburi Bypass Road
  • Route 367: Kanchanaburi Bypass Road
  • Route 368: Ang Thong Bypass Road
  • Route 369: Singburi Bypass Road
  • Route 370 (Suvarnabhumi Road 3): Entrance to Suvarnabhumi Airport
  • Route 372: Aranyaprathet Bypass Road
  • Route 375: Ban Bo - Don Tum
  • Route 3001: Entrance to barracks at Chiraprawat
  • Route 3002: Pak Nam Pho – Tha Ta Kui, designation decommissioned
  • Route 3003: Route 1 – Chao Phraya River (Krok Phra), now rural road 1111
  • Route 3004: Chiraprawat – Sap Samo Thot
  • Route 3005: Nakhon Sawan - Krok Phra
  • Route 3006: Entrance to Takhli Market
  • Route 3007: Route 3265 – Thanam (Uthai Thani Province), designation decommissioned
  • Route 3008: Phayuha Khiri - Noen Makok
  • Route 3009: Hankha original route, designation decommissioned
  • Route 3010: Sapphaya - Route 340, Sankhaburi
  • Route 3012: Entrance to Nong Chang Market
  • Route 3013: Nong Chang – Route 1072, Lat Yao
  • Route 3014:
  • Route 3015
  • Route 3016: Lopburi – Erawan Camp (Lopburi Province)
  • Route 3017: Nikhom – Wang Muang intersection
  • Route 3018:
  • Route 3019: Khok Krathiam intersection (Route 1) – Khok Krathiam Railway Station (Lopburi Province)
  • Route 3020: Phra Phutthabat - Nong Don (Saraburi Province)
  • Route 3021: Entrance to Ban Mo, designation decommissioned
  • Route 3022: Route 3020, Phra Phutthabat – Tha Ruea (Saraburi Province)
  • Route 3023 (Tha Ruea–Tha Lan Road): Tha Lan – Tha Luea, designation decommissioned
  • Route 3024: Route 205, Ban Mi – Khao Chong Lom
  • Route 3027
  • Route 3028
  • Route 3029
  • Route 3030
  • Route 3031: Sing Buri – In Buri District, designation decommissioned
  • Route 3032
  • Route 3033
  • Route 3034
  • Route 3035: 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 3036: Route 3095, Mueang Nakhon Pathom – intersection at Route 346, Don Tum, now part of Route 375
  • Route 3037
  • Route 3038
  • Route 3039
  • Route 3040
  • Route 3041
  • Route 3042
  • Route 3043
  • Route 3044: Sao Hai – Nong Saeng, now part of Route 3041
  • Route 3045
  • Route 3046
  • Route 3047: Mueang Phuket – Nong Saeng, now part of Route 3041
  • Route 3048
  • Route 3049: Route 33, Mueang Nakhon Nayok – Nang Rong Falls (Nakhon Nayok Province)
  • Route 3050: Entrance to Sarika Waterfall (Nakhon Nayok Province)
  • Route 3051
  • Route 3052
  • Route 3053: Route 309 (Pridi Thamrong Bridge) – Route 32 (Ayutthaya Province), downgraded to local road
  • Route 3054: Route 309 – U Thong Road (north side)
  • Route 3055: Route 309 – U Thong Road (south side)
  • Route 3056
  • Route 3057: Bang Pa-In Railway Station – Bang Pa-In, downgraded to local road
  • Route 3058: Route 309 – Dusidaram Temple (Ayutthaya Province), downgraded to local road
  • Route 3059: Route 309 – Phanan Choeng Temple (Ayutthaya Province), downgraded to local road
  • Route 3060:
  • Route 3061:
  • Route 3062: Route 309, Wat Pun – Bang Pahan, designation decommissioned
  • Route 3063: Bo Phong – Khok Mali
  • Route 3064: Ang Thong – Pak Dong
  • Route 3065: Pho Thong – Sawaeng Ha, now part of Route 3064
  • Route 3066: Rangsit – Pratunam Chulalongkorn, designation decommissioned
  • Route 3067: Aranyaprathet – Phai Lom
  • Route 3068: Aranyaprathet – Lahan Sai, redesignated as Route 348
  • Route 3069 (Prachin Anuson Road): Prachin Buri - Sri Maha Phot
  • Route 3070
  • Route 3071 (Khokkha-Bua Lai Road): Prachinburi Railway Station – Khlong Khok Ka, downgraded to local road
  • Route 3072(Siwaboon Road): Junction to Prachantakham, now local road 10-002
  • Route 3073: Entrance to Watthana Nakhon, designation decommissioned
  • Route 3074: Entrance to Kabinkuri, downgraded to local road
  • Route 3075: Junction to Sa Kaeo Railway Station, downgraded to local road
  • Route 3076
  • Route 3077
  • Route 3078
  • Route 3079
  • Route 3080: Entrance to Photharam
  • Route 3081
  • Route 3082: Junction to Tamaka, designation decommissioned
  • Route 3083: Junction to Pak Phraek Station, designation decommissioned
  • Route 3084
  • Route 3085 Yang Ko–Si Mongkhon
  • Route 3086 Lat Ya–Dan Chang
  • Route 3087 Ratchaburi-Cheek Ong
  • Route 3088 Ratchaburi-Wan Dao
  • Route 3089: Khao Ngu Stone Park – Route 323 (Ratchaburi Province), now part of Route 3291
  • Route 3090: Ban Chom - Nong Tak Ya
  • Route 3091: (Setthakit Road 1): Motorway 35, Mueang Samut Sakhon – Route 4, Krathum Baen
  • Route 3092
  • Route 3093
  • Route 3094: Entrance to Nakhon Chai Si
  • Route 3095
  • Route 3096: Rachamankha - Sanam Chan, downgraded to local road
  • Route 3097: Route 4, Phra Prathon – Route 35 (Ban Bo), now part of Route 375
  • Route 3098: Entrance to Sam Phran, downgraded to local road
  • Route 3099 (Nonthaburi Road 1, Sanambinnam Road): Route 306 – Pak Kret Airport, combined with Route 3110
  • Route 3100: Route 346, Rangsit – Rangsit Canal (Pathum Thani Province), now part of Route 345
  • Route 3101(Sihaburanukit Road): Entrance to Min Buri (Bangkok), downgraded to local road
  • Route 3102 (Sanphawut Road): Bang Na – Route 3109 (Bangkok)
  • Route 3103 (Wongsawang Road): Bang Hid - Rama VI - Wat Thong Thong (Bangkok), downgraded to local road
  • Route 3104 (Nakorn Khuean Khan Road): Entrance to Phra Pradaeng, downgraded to local road
  • Route 3109 (Old Paknum Railway Road): Khlong Toei – Route 3, downgraded to local road
  • Route 3110 (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 3111: Route 307/Route 3035, Pathum Thani Province – Route 3263, Sena District
  • Route 3112: 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
  • Route 3113 (Phuchao Saming Phray Road): Route 3 – Bhumibol Bridge (Mueang Samut Prakan)
  • Route 3114 (Thai Ban Road): Thai Ban – Pak Nam (Samut Prakan Province), downgraded to local road
  • Route 3115 (Sai Luat Road): Route 3 – Route 3114 (Samut Prakan Province), downgraded to local road
  • Route 3116 (Phraek Sa Road): Route 3 (Bang Ping) – Phraek Sa, downgraded to local road
  • Route 3117 (Khlong Dan-Bang Bo Road, Rattanarat Road): Route 3, Khlong Dan – Bang Na Expressway, Bang Bo (Samut Prakan Province)
  • Route 3119 (Rom Klao Road): Min Buri - Lat Krabang (Bangkok)
  • Route 3120 (Samphan Road): Lam Phak Chi - Nong Chok, downgraded to local road
  • Route 3123: Bangkhla – Bang Nam Priao (Chachoengsao Province), designation decommissioned
  • Route 3125: Bangpakong Intersection (Chachoengsao Province), downgraded to local road
  • Route 3128: Route 3 – Sriracha Market (Chonburi Province), designation decommissioned
  • Route 3129: Junction to Bang Phra Reservoir (Chonburi Province), now local road 24-007
  • Route 3130: Bang Pla Soi Intersection (Chonburi Province), downgraded to local road
  • Route 3131: Chonburi – Khao Bang Sai Temple (Chonburi Province), downgraded to local road
  • Route 3132 (Pattaya-Naklua Road): Route 3 – Banglamung District (Chonburi Province), now local road 2-0008
  • Route 3133: Chonburi – Klaeng District (Chonburi Province), much of route now part of Route 344; remainder now local roads, rural route 3059 and Route 3289
  • Route 3135 (Pattaya-Naklua Road, One Pattaya Road, South Pattaya Road): Na Kluea Market – South Pattaya (Chonburi Province), downgraded to local road
  • Route 3136 (North Pattaya Road): Route 3 – North Pattaya (Chonburi Province), downgraded to local road
  • Route 3137
  • Route 3138
  • Route 3139
  • Route 3140: Entrance to Ban Phe
  • Route 3141: Junction to U-Tapao, designation decommissioned
  • Route 3142:
  • Route 3144: Entrance to Khao Kheow Open Zoo
  • Route 3146:
  • Route 3147 (Si Bunruang Road): Hua Hin – Tha Mai (Chanthaburi Province), downgraded to local road
  • Route 3148: Trat-Laem Ngop
  • Route 3149:
  • Route 3150 (Tha Luang Road): Route 3 (Koh Rong) – Rin Nam Chanthaburi, downgraded to local road
  • Route 3151: Route 3149 (Nong Chim) – Perid Island, one section now rural route 4001 and the remainder downgraded to local road
  • Route 3153 (Phraya Trang Road): Chanthaburi – Tha Mai
  • Route 3154 (Trirat Road): Trirat Bridge – Route 3 (Ploy Siam), downgraded to local road
  • Route 3160: Tha Mi Park – Bang Kradan, now part of Route 3156
  • Route 3161: Route 3 – Ao Kai Intersection (Rayong Province), now local highway 1-0042
  • Route 3162: Junction to Pak Nam Prasae (Rayong Province), now local highway 10-018, 1-0032, and rural route 4036
  • Route 3172: Junction to Khao Yoi Railway Station (Phetchaburi Province), designation decommissioned
  • Route 3181: Entrance to Tha Sae Market
  • Route 3182: Route 3077 (Nong Khing) – Khao Khiao (Nakhon Nayok Province), downgraded to local road
  • Route 3185 (Lat Phrao Road): Bang Sue – Bang Kapi (Bangkok), redesignated as Route 336; now a local road
  • Route 3188 (Phran Nok Road): Fai Chai Junction – Phran Nok Junction (Bangkok), downgraded to local road
  • Route 3191
  • Route 3194: Phanom Thuan District - Phra Thaen Dong Rang - Kamphaeng Saen District, now part of Route 346
  • Route 3195
  • Route 3196
  • Route 3197: 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
  • Route 3214 (Chiang Rak Road, Khlong Luang Road): Route 347, Sam Khok – Rural Highway 3010, Khlong Luang (Pathum Thani Province)
  • Route 3215 (Bang Kruai-Sai Noi Road, Thai: ถนนบางกรวย-ไทรน้อย): Wat Daeng-Sai Noi
  • Route 3216 (Thep Khunakorn Road): Route 314 – Srisothon Road (Chachoengsao Province), downgraded to local road
  • Route 3219: Route 3218 (Nong Taphao) – Pa La U (Prachuap Khiri Khan Province), now Route 3218 and rural route 2052
  • Route 3223: Route 3017 – Khram Phran Intersection (Saraburi Province), designation decommissioned
  • Route 3227: Route 3193 (Phakat) – O Lam Chee (Chanthaburi Province), now rural route 4031
  • Route 3230: Tambon U Thong Sanitation Area – Ban Rai, now part of Route 333
  • Route 3232
  • Route 3233
  • Route 3242 (Ekkachai Road, Thai: ถนนเอกชัย): Samut Sakhon-Bangpakok 8 Hospital
  • Route 3248: Route 3193 (Ban Pa) – Nong Kok (Chanthaburi Province), now rural route 4032
  • Route 3255 : Junction to Ban Laem, now rural route 4033
  • Route 3256 (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
  • Route 3257: Nonthaburi Bridge – Route 340, now part of Route 345
  • Route 3258: Ban Mi District – In Buri, designation decommissioned
  • Route 3260
  • Route 3263
  • Route 3267
  • Route 3268 (Theparak Road, Thai: ถนนเทพารักษ์): Samrong-Bang Bo
  • Route 3270: Khlong Yai District – Hat Lek, became part of Route 318; now part of Route 3
  • Route 3274: Route 3087 (Buakhao Intersection) – Route 3209 (Cheek On), now part of Route 3087
  • Route 3275: In Buri Intersection (Sing Buri Province), downgraded to local road
  • Route 3278 (Seri Thai Road): Bang Kapi – Min Buri (Bangkok), downgraded to local road
  • Route 3286 (Jaranyanon Road): Route 34 (Bang Wua) – Route 314 (Bang Pakong), downgraded to local road
  • Route 3292: Route 318 (Tha Sai) – Laem Klat, now a rural route
  • Route 3294: Route 321 (Kamphaeng Saen) – Kamphaeng Saen Aviation School, designation decommissioned
  • Route 3295: Route 309 – Ang Thong, designation decommissioned
  • Route 3296
  • Route 3300: Route 3 (Khao Yai Chum) – Route 3145 (Suan Son), now local road 1-0016
  • Route 3301: Route 3219 (Nong Phlap) – Yang Chum, now part of Route 3218
  • Route 3307: 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
  • Route 3310: (Phutthamonthon Sai 4 Road, Thai: ถนนพุทธมณฑล สาย 4): Krathum Lom-Phutthamonthon
  • Route 3311: Entrance to Khao Thong, downgraded to local road
  • Route 3312: (Lam Luk Ka Road, Thai: ถนนลำลูกกา): Rangsit-Lam Luk Ka (Pathum Thani)
  • Route 3313: Route 3087 (Pa Wai Chat) – Pong Krating (Ratchaburi Province), now part of Route 3206
  • Route 3315: Route 314 – Route 3296 (Bang Phra), now local road 1-0005
  • Route 3316: (Phutthamonthon Sai 6 Road, Thai: ถนนพุทธมณฑล สาย 6): Raikhing-Song Khanong
  • Route 3320: Route 3 (Kachet) – Hat Yai (Rayong Province), downgraded to local road
  • Route 3323 (Thetsaban 1 Road, Phisanathumkhun Road): Route 3 (Nern Sung) – Route 3147 (Chanthaburi Province), now local highway 21-001
  • Route 3324: Route 3313 (Suan Phueng) – Huai Suea (Ratchaburi Province), downgraded to local road
  • Route 3328: Khao Bo Kew settlement – Hua Ngew (Nakhon Sawan Province), downgraded to local road
  • Route 3341: Ko Pho – Route 3245 (Chonburi Province), now local road 1-1005
  • Highway 3344: (Srinagarindra Road, Thai: ถนนศรีนครินทร์): Bang Kapi-Samut Prakan
  • Route 3345 (Charuwar Road): Phanat Nikhom - Nong Chak (Chonburi Province), redesignated as Route 349
  • Route 3347: Phanom Sarakham - Ban Sang, now part of Route 3076
  • Route 3351
  • Route 3354
  • Route 3356
  • Route 3361: Dan Makham Tia - Nong Pak Dong, designation decommissioned
  • Route 3370: Route 3247 (Khao Hom) – Route 3193 (Ban Pa), downgraded to local road
  • Route 3371: Route 3143 – Route 3191 (Rayong Province), now local road 1-0063
  • Route 3373
  • Route 3376
  • Route 3377: Route 3 (Khao Din) – Nong Samet (Rayong Province), now local roads 10-017 and 1-0036
  • Route 3379: Route 3068 (Aranyaprathet) – Pa Rai (Sa Kaeo Province), combined with Route 3397, now part of rural route SS 3085
  • Route 3380: Route 3068 (Nong Yak) – Route 3381 (Ang Sila), downgraded to local road
  • Route 3381: 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 3382: Route 3068 (Khok Phrek) – Khok Rek, now rural road SK 3069
  • Route 3383: Route 3367 (Khao Noi) – Route 3384 (Sai Sing), now part of Route 3366 and Route 3067
  • Route 3392: Route 3 (Huai Pong) – Nong Fae Intersection (Rayong Province), downgraded to local road
  • Route 3393: Route 3198 (Chong Kum) – Route 348 (Kaew Petch), now part of Route 3395
  • Route 3394
  • Route 3396: Route 1 – Chao Phraya River (Nakhon Sawan Province), downgraded to local road
  • Route 3397: Route 3068 (Na Ngam) – Route 3381 (Khok Sung), combined with Routes 3379 and 3381 and redesignated Route 348; now rural route 3085
  • Route 3399: Route 3 (Nong Si Nga) – Laem Sadet (Chanthaburi Province), now rural routes 1036 and 4001
  • Route 3406: Route 3 (Na Yai Am) – Nong Chek Soi (Chanthaburi Province), downgraded to local road
  • Route 3407: Route 3 (Nong Khla) – Tapong (Chanthaburi Province), downgraded to local road
  • Route 3408: Route 3 (Don Samrong) – Taeng, now rural route 1030
  • Route 3411: Route 3253 (Don Yang) – Route 3374 (Nong Toi Tai), now part of Route 3374
  • Route 3412
  • Route 3413: (Bang Bo Bypass Road, Thai: ถนนเลี่ยงเมืองบางบ่อ
  • Route 3414: (Phutthamonthon Sai 5 Road, Thai: ถนนพุทธมณฑล สาย 5): Omnoi-Salaya
  • Route 3415: (Phutthamonthon Sai 7 Road, Thai: ถนนพุทธมณฑล สาย 7): Sam Phran-Nakhon Chai Si River
  • Route 3417: Junction to Nong Yai, downgraded to local road
  • Route 3418: Entrance to Bang Sai, now local road 1-0044
  • Route 3419: Junction to Bang Sai, downgraded to local road
  • Route 3420
  • Route 3421: Route 317 (Wang Chik) – Nong Yai, now rural route SK 3008
  • Route 3423
  • Route 3430 (Ban Na Road): Route 3 – Nern U Thong, downgraded to local road
  • Route 3433 (Khao Wong Road): Route 3 (Kao Din intersection) – Route 3406 (Rayong Province), downgraded to local road
  • Route 3434: Route 317 – Route 317 (Khao Chakan), now rural route 3087
  • Route 3437(Sunthorn Vej Road): Route 3 (Noen Din intersection) – Noen Yong, downgraded to local road
  • Route 3439: Route 321 – Route 3431 (Suphan Buri Province), now part of Route 321
  • Route 3451
  • Route 3454
  • Route 3477:Route Bang pa in - Chedi Wat Sam Pluem Phai Ling
  • Route 3482: Junction to Uthai, designation decommissioned
  • Route 3484: Route 3249 (Khlong Plu) – Chanthak Lom (Chanthaburi Province), downgraded to local road
  • Route 3485: Route 3462 – Route 3198 (Sa Kaeo Province), now part of Route 3462
  • Route 3513: Route 321 – Ban Yang (Suphan Buri Province), downgraded to local road
  • Route 3519: Khlong Son – Khlong Muang, now rural road 1036
  • Route 3584
  • Route 3632: Entrance to Wat Kamphaeng (Ayutthaya Province), downgraded to local road
  • Route 3633: Bang Toei – Chao Phraya River (Pathum Thani Province), downgraded to local road

Southern Thailand

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.

Arunprasert Road

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

Bypass marker

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.

SK.3015

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
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

References
  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
  4. "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.
  • 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.
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