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We often cannot see the traffic conditions clearly at crossroads. People 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, the light will turn on; pedestrians will be notified that a car from left is reaching in short. Moreover, when cars are coming from both sides, both lights will be on and the mirror will spin in order to inform both drivers and pedestrians to slow down.