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With the increasing uses of black boxes for vehicles, they are being widely studied and developed. Existing black boxes store only video and sound, and have limitations in accurately identifying accident contexts. Besides, data are lost if the black box in the vehicle is damaged. In this study, a smart black box was manufactured by storing the additional data, including on the tire pressure, in-vehicle data (e.g., head lamp operation), current location, travel path and speed, and video and sound, using OBD-II and GPS to improve the efficiency and accuracy of accident analysis. An external storage device was used for data backup via wireless LAN to allow checking of data even when the black box is damaged. [ABSTRACT FROM AUTHOR]