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Rear end collisions are relentless on high-speed roads. So, we design an inflatable emergency stop sign, in order to inform the driver of the emergency stop in the distance. Inflated by foot, the sign can form a large 'exclamation point' in a short time. Put on the top of the car, the sign can be seen by drivers in the distance. Bright colors and the use of reflective material enable the sign to play a role of warning well day and night.