It has strong light penetration and long visual distance, which can meet various harsh climatic conditions and effectively reduce the occurrence of traffic accidents; it has its own light source to take care of all traffic subjects; it has low energy consumption, high efficiency, safety and convenience; Wide range of energy applications and simple maintenance. In the past many years, due to the shortcomings of electric energy and luminous technology, traffic sign facilities have mainly used light directional return retroreflective materials (commonly known as reflective film materials) technology. Traffic sign facilities made of reflective materials passively reflect light when illuminated by a light source and play a role in visual recognition. However, when there is no main body of light source, there is no recognition function at night. In severe weather conditions such as rain and fog, the visual recognition distance depends on the brightness of the light source body, which seriously affects the direction and situation recognition of vehicles and pedestrians.