Automatic traffic signal is an intelligent intersection control device based on artificial intelligence and vehicle road coordination technology. It can automatically adjust the red and green duration according to real-time traffic flow, weather conditions, and emergency vehicle priorities, achieving efficient passage with "zero manual intervention". AI recognizes the queue length of vehicles, optimizes phase duration, and improves traffic efficiency by an average of 25%. The visibility and rainfall sensors are connected, and the yellow light and full red time are automatically extended in haze or rainstorm weather. Typical applications: urban main roads, expressway ramps; Schools, hospitals, and commercial areas are prone to traffic congestion at intersections; Intelligent Connected Vehicle Demonstration Zone/Autonomous Driving Test Field.