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There are often tragedies happening around us like this .The picture on the device which prevents traffic accident in foggy day shows that there are the most advanced device to receive infrared in front of the car.When you can't see the road clearly in the foggy day, you can turn on it.According to the infrared theory , the situation of the road will be reflacted on the screen of the nylon.Together with the warning of the characers ,it can prevent traffic accidents.