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When there are two sets of traffic lights that are usually established beside sharp turn intersections .The first set warns the driver of the traffic situation at an intersection further down the road.
Because they look similar, lots of drivers mistake the predictor set for a normal traffic light and stop before the actual intersection.
To avoid this kind of accident, this design uses color-gradient traffic light equipment to warn drivers. 50 meters before the traffic lights, reflective signs show a green to red gradient depending on the controlling traffic light. When the traffic light is green, all reflective signs will be green.