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In most of bicycle traffic accidents, more and more riders died from truck accidents. According to reports, there are about 100 thousand people died from large trucks every year around the world. The truck accident, has become the first big road ‘’killer’’. Since the turning radius of the truck rear is too short, riders have no time to consider where the safe or dangerous area is. Although it is difficult to observe the turning radius, it can be calculated. We have designed a tool to project turning radius which is set to the head of the truck. When the truck is making a turn, the dangerous area will be projected in the fore body to warn the