Route 3 (Thailand)

Route 3 (Thailand)
Country	THA
Type	Highway
Alternate name	Banthat–Ban Chang Highway; Sukhumvit Road (part)
Length km	1,192
Direction a	Northwest
Direction b	Southeast
Terminus a	Bangkok
Terminus b	Trat

Route 3 (Thailand) is a primary national highway running from Bangkok to Trat Province along the eastern seaboard of Thailand. The highway traverses major urban and industrial centers including Chonburi, Pattaya, and Rayong, linking ports, airports, and border crossings that connect to regional transport networks such as the Laem Chabang Port and access routes toward Cambodia. Route 3 forms part of national transport corridors that intersect with international corridors like the Asian Highway Network and regional development initiatives associated with the Greater Mekong Subregion.

Route description

Route 3 begins in Bangkok and proceeds southeast through the Bang Na district toward the eastern provinces, passing the Bang Na–Trat Road alignment and sections commonly referred to as Sukhumvit Road. En route the highway skirts industrial zones such as the Eastern Seaboard Development Program areas around Map Ta Phut and Laem Chabang Port, traverses coastal districts adjacent to Gulf of Thailand waters, and continues to the southeastern provinces near Trat, serving communities that include Samut Prakan, Chachoengsao, and Rayong Province. The route connects to airport facilities including Suvarnabhumi Airport and U-Tapao International Airport via feeder roads and intersects major north–south and east–west arteries such as the Motorway 7 (Thailand), Highway 36 (Thailand), and National Route 4 (Thailand) alternatives toward Songkhla and Phuket. Coastal sections offer access to tourist destinations like Pattaya and islands reachable from ports such as Ko Samet and Koh Chang.

History

The corridor that became Route 3 developed during the twentieth century as Thailand implemented infrastructure projects influenced by international investment and post‑war modernization programs tied to institutions like the World Bank and bilateral partners such as Japan and the United States. Early upgrades paralleled the expansion of the Eastern Seaboard Development Program in the 1980s which emphasized export processing zones near Laem Chabang, Map Ta Phut Industrial Estate, and petrochemical complexes. Route 3 has been affected by regional conflicts and diplomacy such as border tensions involving Cambodia–Thailand relations and cooperative frameworks like the ASEAN Free Trade Area. Over decades the highway absorbed improvements connected to national initiatives including the Thai National Economic and Social Development Plan cycles and transport policies endorsed by ministries headquartered in Bangkok.

Major junctions and termini

Key termini and junctions along Route 3 include its origin in Bangkok near arterial routes serving Sukhumvit and access points to Suvarnabhumi Airport, junctions with Motorway 7 (Thailand) toward Chonburi and Pattaya, connections to Highway 36 (Thailand) toward industrial zones at Map Ta Phut, links to coastal ports at Laem Chabang Port, and the southeastern terminus near Trat providing onward links to border crossings leading toward Koh Kong Province in Cambodia. Other significant intersections meet provincial highways serving cities like Chachoengsao, Bang Pakong, Ban Chang, and feeder routes toward tourist hubs including Rayong and Ko Chang ferry terminals.

Traffic and usage

Traffic on Route 3 varies from heavy commuter flows in the Bangkok Metropolitan Region to freight volumes associated with containerized exports at Laem Chabang Port and raw material movements for the Map Ta Phut Industrial Estate. The corridor supports logistics chains for multinational firms operating in Eastern Seaboard (Thailand) zones, linking to supply networks tied to firms from Japan, China, United States, and European Union investors in sectors represented by companies such as SCG, PTT Public Company Limited, and multinational automakers. Seasonal tourism increases traffic toward Pattaya, Rayong, and island gateways like Koh Chang National Park, while agricultural transport serves hinterlands supplying markets in Bangkok and export facilities connected to organizations like the Thai Chamber of Commerce.

Road standards and maintenance

Route 3 is managed under standards established by agencies such as the Department of Highways (Thailand) with maintenance coordinated alongside provincial authorities in Samut Prakan Province, Chonburi Province, Rayong Province, and Trat Province. Sections of the highway include multi‑lane surfaced carriageways, grade separations near urban centers, and at‑grade intersections in rural stretches; pavement design reflects loadings from heavy vehicles servicing ports and industrial estates. Maintenance cycles involve resurfacing, shoulder strengthening, and drainage improvements informed by studies from institutions like the Asian Development Bank and technical cooperation with engineering firms and universities such as Chulalongkorn University and King Mongkut's Institute of Technology.

Future developments and upgrades

Planned upgrades aim to relieve congestion, improve safety, and increase freight throughput through projects including widening schemes, construction of bypasses around urban cores like Pattaya, and enhanced intermodal links to Laem Chabang Port and U-Tapao Airport envisioned in regional plans coordinated with the Eastern Economic Corridor (EEC) initiative. Investment proposals involve public–private partnerships drawing interest from entities such as Thai Airways International (logistics arm), State Railway of Thailand for multimodal integration, and foreign investors from China and Japan seeking supply chain efficiencies. Environmental assessments and community consultations reference conservation areas like Khao Laem Ya–Mu Ko Samet National Park and aim to align upgrades with tourism strategies promoted by the Tourism Authority of Thailand.

Category:Roads in Thailand