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Data recorded by vehicle-mounted electronic control units (ECUs) are highly useful in traffic accident reconstruction. In this context, event data recorders (EDRs) are airbag ECU components used to log information from crash events, typically providing data on speed, accelerator operation, RPMs and brake lamp activation for a period of around 5 s before a collision. Information on accelerator/brake lamp operation is very useful in understanding pre-crash driver actions, but the accuracy of EDR speed data must be checked in this regard. Such data are unlikely to reflect actual speed during brake-related skidding, for example, as they are determined from the rotational speed of the drive train. Thus, it is important to check the accuracy of EDR speed data in accident reconstruction. Meanwhile, pre-crash safety systems (PCSs) are also becoming more widespread in automobile usage today.