In order to implement the spirit of General Secretary Xi Jinping's important instructions of "people first, life first", and in response to the strategy of building a strong transportation country and the requirements of "promoting the deep integration of a new generation of information technology and transportation" in the "14th five-year Plan for the Development of Modern Comprehensive Transportation system", the platform through clouds and fog came into being. In the face of the pain point of the traditional traffic monitoring system under extreme weather conditions, the cloud-breaking system integrates infrared, thermal imaging and visible light multi-modal technologies, and cooperates with the ground-air collaborative unmanned aerial vehicle system to build a real "all-weather, all-day traffic safety supervision system ". The core innovation of the system lies in three self-developed algorithms: YOFA-Net defogging algorithm based on perception enhancement can increase the recognition rate by more than 37% in extreme weather; Seamless integration of infrared and visible light images is realized SuperFusion cross-modal fusion technology. The FFA-YOLO human body recognition algorithm based on attention mechanism has strong environmental adaptability and ground monitoring cooperates with unmanned aerial vehicles. It is more innovative to introduce DeepSeekV2L models to realize real-time accident detection and violation detection, it also provides in-depth analysis and knowledge questions and answers to achieve a leap from perception to cognition. Breaking through clouds and fog is not only a traffic perception platform, but also an "all-weather guardian" of smart city traffic safety. Through AI enabling traffic management, it helps to build a modern traffic management system, so that extreme weather will no longer become a blind area for people's travel safety.