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With the increasing number of long-distance trucks, logistics vehicles and family cars, traffic safety problems are becoming increasingly serious. Traffic accident rate remains high, when the vehicle in the way of rollover, collision and other serious accidents, the driver can not get out, even due to serious injuries and can not call for help or call the cell phone, resulting in the loss of self-help; in an emergency, the equipment available for help can not be used normally, such as cell phone failure, the driver did not bring a cell phone, etc.. Secondly, the driver suddenly fell ill and lost