Case Study：With the rapid development of China's economic construction, urban construction is changing with each passing day, urban expressway elevated highway and overpasses enter a period of rapid development. Each of the distinctive elevated and overpasses is inlaid in the middle of the city like a colorful scroll, which makes the city beautiful, especially the colorful night lighting of the bridge makes the city full of vitality, giving people a beautiful enjoyment and leaving endless delusions. The engineers of Hengpeng team pay attention to road lighting during design. According to the principle of aesthetics, energy-saving, LED guardrail street lighting is used to protect the original streamline of the bridge, meet the requirements of night lighting, and meet the requirements of energy saving.