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Accuracy of Speed Zone Recorded in The Victorian Police-Reported Crash Database Differs by Speed Zone in Metropolitan Areas

Stephan, K., Newstead, S.

Speed Limits 1

ARSC conference 2017

We aimed to investigate the accuracy of the speed zone recorded for crashes in 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 was compared to the true speed limit. Speed zone was recorded incorrectly for one-third of crashes. The positive predictive value was low; for example, almost 90% of crashes recorded as occurring in 50 km/h zones did not occur in 50 km/h zones. Implications and recommendations for rectifying the problem are discussed.