Micro prism retroreflection technology is to use very small cube elements (micro prism) to complete the function of light return. Using this principle of retroreflection, we can make use of the illumination of the lamp and the original reflection of the light to “light up” the front, so that the place where the reflective film is pasted is brighter than surrounding environment, so as to improve the distance for the driver to find the object in front. It is an efficient and cost-effective traffic safety guarantee scheme.