Accuracy of speed zone recorded in the victorian police-reported crash database differs by speed zone in metropolitan areas

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We investigated the accuracy (overall, sensitivity and positive predictive value (PPV)) of the speed zone recorded for the location of crashes in a sample of Victorian police-reported crash data. Data on crashes that occurred on 111 road segments (where the true speed limit was known) in the Melbourne metropolitan area were obtained. The speed zone recorded for each crash location was compared to the true speed limit. Speed zone was not recorded correctly in almost one-quarter of crashes. Sensitivity varied by speed zone and was highest for crashes that occurred in 60 km/h zones. PPV was extremely low for crashes recorded as occurring in 50 km/h zones; almost 90% did not occur in 50 km/h zones. Misclassification of speed zone was less frequent when police attended the scene. The misclassification affected estimates of association between speed zone and crash severity. Implications and recommendations for rectifying the problem are discussed.
Original languageEnglish
Title of host publicationProceedings of the 2017 Australasian Road Safety Conference
EditorsM. Mongiardini, R. H. Grzebieta, P. Palamara
Place of PublicationACT Australia
PublisherAustralasian College of Road Safety
Number of pages8
ISBN (Print)9780648184805
Publication statusPublished - 2017
EventAustralasian Road Safety Conference 2017: Expanding our Horizons! - Perth, Australia
Duration: 10 Oct 201712 Oct 2017


ConferenceAustralasian Road Safety Conference 2017
Abbreviated titleACRS 2017
Internet address

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