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Journal Article

Citation

Cameron M. J. Australas. Coll. Road Saf. 2015; 26(3): 19-32.

Copyright

(Copyright © 2015, Australasian College of Road Safety)

DOI

unavailable

PMID

unavailable

Abstract

Relationships linking travel speeds with the risk of casualty crashes have been combined with on-road speed surveys to estimate the proportion of crashes associated with each speed range and potentially attributable to speeding at different levels. This paper used speeds recorded by mobile speed cameras operated covertly in Melbourne 60 km/h speed limit zones. A 1% sample of mobile camera sessions was used to provide estimates of the proportion of casualty crashes attributable to low and high level speeding, using analysis methods similar to those used previously to analyse large speed surveys in Perth and urban Queensland. The analysis compared the results from functions linking casualty crash risk with absolute speed or with the difference between travel speed and the mean speed (mean-centred speed). The effect of different caps on the magnitude of the risk at high speeds was also examined. The study concluded that a low cap placed on the risk functions is not justified; however analysis using higher caps should make use of the 95% confidence limits on the risk estimate. A rescaled version of the mean-centred speed risk function, referenced to the risk at the speed limit, provides similar results to the risk function based on the absolute speed in 60 km/h limit zones. Rescaled meancentred speed risk functions could be applied with some confidence to estimate the casualty crash risk, relative to that at the speed limit, at speeds in other urban and rural speed limit zones. From the empirical results, it was also concluded that the pattern of speeding and its contribution to casualty crashes in Melbourne 60 km/h limit zones was very different from that in 60 km/h zones in Perth and urban Queensland.


Language: en

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