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When pedestrians and bicycles travel between city roads, accidents often occur at the corners of city buildings. To avoid that, the biker must ring the bell and the pedestrian should also pay attention to it. However, accidents may occur if either side is not paying attention.
JOJOJO is a sound device that is installed in corners. When the bike runs over it, it will make a "JOJOJO" sound to warn pedestrians around the corner. If the bike tries to avoid the device, the rider will also be able to see the pedestrian earlier by going around the outside to avoid accidents.