Abstract

Using Vetronix Crash Data Retrieval software, crash data can be downloaded from the restraint control modules (RCM) on some Ford motor vehicles. These RCMs are part of the on-board computers that control the vehicle's airbags. An earlier study used version 2.1 of the Vetronix software to download longitudinal speed change and acceleration data from RCMs on two Ford vehicles. The accuracy of the data was then evaluated. The current study reanalyzes the same RCM data using version 2.4 of the Vetronix software. Unlike version 2.1, version 2.4 did not report duplicate data points. Results showed that there were differences between the acceleration and speed change data reported by the two versions. The speed change values reported by the newer version were, on average, more accurate than those of version 2.1 for one of the vehicles, the Ford Windstar. For the Windstar RCM data, the average underestimate was 0.23 km/h using version 2.4. However, the speed change values were less accurate for version 2.4 than for version 2.1 for the Ford Crown Victoria. Using the version 2.4 data, the average underestimate was 0.73 km/h for the Crown Victoria RCM data. The general underestimate of speed change can be accounted for by the incomplete record of the crash pulse reported by both software versions.

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