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When we driving a small car behind a large automobile,we can not see the traffic lights and road conditions,and we can not prejudge the actions of the large automobile. It is likely to run red lights and cause rear-end collision . This product is placed on the marker line at the junction, and the lights follow the changes of the traffic lights. Drivers can see the traffic lights' change although your line of sight is blocked. The first layer is a transparent shell, the second layer is LED lamp which can shine, the third layer is solar panels which can provide electricity for LED, the fourth layer is the ground. So it's environment friendly.