Hanoi rolls out AI-controlled traffic lights across key downtown streets

The system, which went live on Dec. 13, uses AI cameras to control traffic signals in real time along Hue, Hang Bai, Tran Hung Dao, Tran Phu, Nguyen Thai Hoc and Quan Su streets. Instead of fixed signal cycles, the lights now automatically adjust based on live data on vehicle volume, density and direction of travel.

According to Hanoi’s traffic police, the AI system analyzes conditions at each intersection and synchronizes signals across consecutive junctions, a setup known as a “green wave.” The goal is to keep vehicles moving at a steady speed, reducing the stop-and-go delays that previously forced drivers to wait through multiple red lights.

For regular commuters, the difference is noticeable. Bui Bich Thuy, who frequently travels along Hue Street, said the time needed to cover the more than 1.2-kilometer route has dropped sharply. During morning rush hour, the trip once took around 20 minutes, with vehicles stopping two or three times at each intersection. Since the AI-controlled lights were activated, travel time has fallen to about 10 minutes, with traffic flowing almost freely at midday.

Traffic police officials say the new model has reduced average journey times by roughly 31%, increased overall travel speed and lowered the number of stops vehicles must make along these routes.

Beyond easing congestion, the system can also recognize priority vehicles and official motorcades. When such vehicles are detected, traffic lights automatically switch to green to ensure uninterrupted passage.

Hanoi has already installed 1,837 AI cameras across 25 key traffic corridors. City authorities plan to add about 2,460 more cameras in 2026, expanding smart traffic control to major intersections, arterial roads, river-crossing bridges, hospitals and bus stations.