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Tumbler Street signs usually put in the outdoors and use in an emergency.Warning sights are felled by wind,and the large surface of warning sight are more easily blow down in changeable weather .It cause se- rious accident when people can no see the warning sight.This 45°-shaking concept we are put forward on warning sight release the wind drag, so that it would not be blow down and we also can see the sight clea- rly through the 45 angle of view. It will return to its original situation without wind. This uncomplicated solut- ion solve the problem and avoid the dangerous.