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We often cannot see the traffic conditions clearly at crossroads. Although most of the roads have installed convex mirrors, people still cannot see the traffic conditions clearly because of blind spots and shades caused by other view. Therefore, I have designed Safe Convex, a detective device which can be installed on convex mirrors in order to avoid traffic accidents. Safe Convex has signals on both sides. When a car is coming from the left side, the light of the left will turn on; pedestrians will be notified the car. Moreover, when cars are coming from both sides, both lights will spin to inform both drivers and pedestrians to slow down.