Self-Controlled In-Vehicle Traffic Light Based on The 4th Generation Mobile Communication

The interaction between vehicles and road equipment is an important section of intelligent transportation, which can help drivers know road condition in advance to maintain traffic efficiency and safety. Intersections especially unsignalized intersections are main regions occurring traffic accidents. Major part of reason is that drivers can not follow direction indicated by the traffic lights, that is to say, which drivers cannot know traffic lights in advance. And the interaction between traditional vehicles and signal lights mainly depends on eyes of drivers, but the influence of weather, front large truck, signal lamp malfunction and other external factors may cause some interference under the process of the information exchange. Owing to this problem, the authors propose a kind of self-controlled in-vehicle traffic light based on the 4th Generation mobile communication technology(4G) with Raspberry Pi 4B, SIM7600X-4G-HAT, GPS+BD double mode positioning module, 6 channel 5V low level trigger relay, model 300 road lift traffic lights and Android phones. Through the MQTT server, phones as the vehicle terminals interact with traffic lights to accomplish in-vehicle traffic lights. Traffic lights adjust their timing adaptively according to numbers of vehicles within 240s to ease the traffic pressure, which utilizes identification code of Universally Unique Identifier(UUID). Furthermore, broadcasting alert between Android phones is the beginning of information exchange among vehicles. The application is running in the background under the leisure time.