Authors: P Hutchinson Published: 10 Oct 2011

Abstract

In South Australia, a blackspot is considered to be somewhere with at least three casualty crashes reported in five years; similar criteria are used in other developed jurisdictions. Such a small number of crashes is inherently highly variable, and the selection of sites by this means will give different results from one time period to another. Blackspot programs have produced positive safety benefits over many years and are consequently believed to be highly cost-effective. This paper, which is part one in a two part series, describes the approach to blackspot and investigates whether even better results are likely to be obtained by a procedure that is less dependent on the vagaries of crash numbers.
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