Bangkok Expressway Collapse Triggers Severe Traffic Disruptions

BANGKOK, Thailand — Motorists in Bangkok faced significant traffic disruptions following the collapse of a new expressway on March 15, 2025, which severely damaged a critical ramp connecting to the southbound Rama II Road. Transport authorities have recommended alternative routes while emergency crews assess the site.

Surachet Laophulsuk, governor of the Expressway Authority of Thailand (Exat), noted that very heavy traffic congestion is expected as both inbound and outbound lanes on the Chalerm Maha Nakhon expressway ramp near Dao Khanong toll plaza have been blocked. “Debris removal will take about seven days, and we aim to reopen the inbound side of the ramp soon after,” Surachet stated during a visit to the collapse site on Sunday.

However, the outbound section suffered extensive damage and will require new beams to be constructed and installed, extending the repair timeline to approximately 30 days. This section of the expressway is vital as it connects Bangkok to Thon Buri via the Rama IX Bridge across the Chao Phraya River and is a key route to the South via Rama II Road.

Despite plans to create two temporary lanes for inbound traffic, Surachet emphasized that motorists should avoid the Rama IX Bridge if possible. “Motorists should leave home for work by 5:30 a.m. to mitigate delays,” he advised.

The investigation into the cause of the collapse will commence once debris is cleared from the area. Surachet indicated that potential causes could include land subsidence, further complicating the ongoing assessment. “There are many factors involved, and we aim to conclude the investigation 20 days after clearing the site,” he mentioned.

The collapse occurred during construction of the new Rama III-Dao Khanong-Bangkok Outer Western Ring Road expressway. Surachet addressed concerns regarding the safety of the structure, stating that while collapses can occur during construction, the finished expressway is designed to be stable.

Meanwhile, Withaya Yamoung, deputy permanent secretary for transport, recommended alternative routes for drivers traveling between Bangkok and Thon Buri, suggesting use of the new Thosamarachan Bridge and bypassing the Rama IX Bridge altogether. Suggestions also included using Sathon Road and sections of the Industrial Ring Road to avoid the congested area.

Adding to the gravity of the incident, the Exat confirmed that the death toll from the accident has risen to six, following the tragic death of an injured Myanmar man at Taksin Hospital late Saturday. Previously confirmed fatalities include a 39-year-old Thai engineer and three other workers, both Thai and foreign.

Traffic authorities anticipate continued delays and are urging drivers to remain informed and flexible with their travel plans as recovery efforts progress and further details emerge regarding the expressway’s reopening timeline.