Highway safety is always an important issue for automobile industry, so many researches have been conducted to prevent from or reduce the accidents. Cooperative Collision Warning (CCW), which provides an active safety mechanism for vehicles on highways, is implemented by exchanging static and dynamic vehicle parameters with neighboring vehicles through inter-vehicle wireless communications. Received information is not only used for calculating the relative safety distance between neighboring vehicles, but also stored in a Motor Vehicle Event Data Recorder (MVEDR) for future accident investigation. A CCW-based MVEDR can easily rebuild the trajectory and interaction between the host and neighboring vehicles after an accident. This device saves time, labor and cost required for accident analysis and reconstruction.