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A tightly tied banner, when it faces the strong wind like typhoon, gets too much stress on the rope which will cause it to break. A broken banner is very dangerous because it could blind the view of drivers and pedestrians, leading to terrible accidents.
When strong wind hits the banner, the rope wrapped in the device loosens, letting the bottom part of the banner wave freely. When the wind gets calm, the rope gets wrapped again by the tension of spring in the device.
This device is small, easy to install, and even inexpensive. If installation of this device is forced by law, accidents caused by damaged banners will reduce dramatically.
Yonsei University. Republic of Korea
Seoul, South Korea