Outer Bangkok Ring Road, Ring road network in Bangkok Metropolitan Area, Thailand.
The Outer Bangkok Ring Road is a 181-kilometer loop connecting Bangkok with surrounding provinces including Samut Prakan, Nonthaburi, Pathum Thani, and Phra Nakhon Si Ayutthaya. The network includes toll road sections and a major bridge crossing the Chao Phraya River.
Construction began in 1978 as Highway 39 and was reclassified as Highway 9 in 1996 following the Master Plan for Intercity Motorways. This reclassification reflected the restructuring of the regional road system.
The road was named during royal celebrations and stands as a symbol of the nation's modern infrastructure growth. This naming reflects its importance as a key transportation link connecting multiple regions around the capital.
A modern free-flow system was implemented in 2022 and handles approximately 110,000 vehicles daily without congestion bottlenecks. Multi-lane sections allow smoother traffic movement for commuters and through-traffic.
The network includes a substantial bridge crossing the Chao Phraya River, standing as a notable structural feature within the regional system. This crossing represents an engineering accomplishment that connects disparate areas across the waterway.
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