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This Technical Report describes the determination of impact severity in road vehicle accidents as defined in ISO 12353-2, based on recorded acceleration and velocity data and derived parameters from vehicle crash pulse recorders or event data recorders, including data from self-contained devices or vehicle integrated functionalities. Methods applicable to the interpretation of recorded ?v data from event data recorders fulfilling the requirements of United States Code of Federal Regulations 49 CFR Part 563 are also included.This Technical Report includes definitions and interpretation of recorded data related to impact severity determination. Some information on application of the data are also provided.The purpose of this Technical Report is to interpret available recorded crash pulse data. The methods in this Technical Report are applicable to interpretation of crash pulses in both longitudinal and lateral directions. However, based on available data, most examples are given for the longitudinal direction.This Technical Report does not address aspects such as the pre-crash phase, data element specifications, and data recording and retrieval technology.