![]() ![]() A case study pertaining to an HVEDR record of a commercial vehicle having a peculiar recording anomaly is presented. This paper provides the forensic engineer with HVEDR engine manufacturer download coverage and tools needed (as of the presentation of this paper), and explores anomalies in event recording that the forensic engineer should be aware may exist. HVEDR records oftentimes provide valuable information that assists the forensic engineer in analyzing collision or failure events. ![]() Unfortunately, there are no uniform standards as to the information recorded or even the triggering criteria for an event regarding heavy commercial vehicles. Some heavy commercial vehicle engine manufacturers even provide an additional record of the last stop of the vehicle. Many collision analysts are aware that most heavy commercial vehicles are likewise equipped with heavy vehicle event data recorders (HVEDRs) that may trigger during a hard braking or sudden deceleration event - or when the driver activates a signal to trigger an event to the system. Since the 1990s, domestic passenger vehicles have been equipped with increasingly more sophisticated supplemental restraint system event data recorders (EDRs) that have become more commonplace in collision analysis.
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