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As a road sign, road reflecting mirror, however, is often unable to play a warning role. In the area with narrow alleys, the scene of complex streets causes people difficult to judge; in the rain, it also causes people difficult to judge because of rain stains.
To improve the problem, there increases flashing yellow lights on this design. According to whether the light is sufficient under the environment, it provides flashing warning as following: when sufficient, it analyzes the images which mirror received; when insufficient, it analyzes the change of light.