The installation of smart traffic signal systems at 72 major intersections across Bangkok has significantly improved traffic flow, reducing travel delays by an average of 10-41%, Governor Chadchart Sittipunt announced on Thursday.
The Bangkok Metropolitan Administration (BMA) has begun replacing conventional fixed-time traffic lights with adaptive systems that use AI-powered software and advanced image-processing cameras.
The technology enables real-time monitoring of traffic volumes and adjusts green light durations accordingly. This prevents vehicles from idling unnecessarily when no traffic is present and helps ease overall congestion.
According to the BMA, the system also monitors delay times to prevent traffic buildup extending beyond intersections.
The 72 intersections currently equipped with the adaptive system include major arteries such as Rama IX, Din Daeng, Phaya Thai, Sukhumvit, Ploenchit, Rama I, Rama IV, Sathon, Silom, Surawong, Si Phraya, and Phahon Yothin.
Previously, Bangkok had 561 traffic lights—most operating on fixed schedules or manually controlled by police—which often led to inefficient traffic patterns and increased waiting times.
Governor Chadchart said the smart systems have already improved traffic flow by around 15% during off-peak hours. Evaluations are ongoing to assess their performance during rush hours in collaboration with traffic police.
He also noted additional benefits, including smoother vehicle movement, fewer unnecessary stops, reduced fuel consumption, and lower levels of air pollution.
The city plans to expand the adaptive traffic system to another 200 intersections next year, aiming to cover more critical areas.
Despite the technological advances, Chadchart emphasised that traffic discipline remains vital. He urged all road users to comply with traffic laws and signals to ensure the system functions effectively.
He added that in heavily congested areas, smart systems alone are not sufficient; a combination of adaptive technology and active police management is still required to effectively manage complex traffic situations.
