To effectively reduce the energy consumption and operation costs of highway tunnel lighting, the advanced information technologies are applied to the tunnel smart lighting system of highway tunnels, and the highway tunnel smart lighting based on KNX technology is proposed. First, according to factors such as parking sight distance, design speed, system response time, and driving process, the "ondemand lighting" scheme is formulated to ensure driving comfort and driving safety. Second, on the basis of making full use of the surveillance system, communication system, and various data resources, KNXnet/IP routers, vehicle detectors, and other facilities are introduced to accurately grasp the situation of vehicles in the tunnel through data analysis, so as to achieve "ondemand lighting". Finally, according to the statistical data of operating toll highways in Sichuan Province, the energysaving benefit of this system is excellent. This system is in line with the development trend of smart traffic, not only can fully guarantee the lighting safety and improve the energysaving level, but also has advantages in system stability, scalability,  and network security.

