The aim of this study was to estimate the long-term effectiveness of random breath testing (RBT), using time series analyses of statistical data on accidents and police enforcement in four Australian states: New South Wales, Queensland, Western Australia, and Tasmania. Daily accident data were analysed utilising a log-linear model that controlled for a range of seasonal, weather, economic and road user factors, and decomposed the overall impact of RBT into three components: an Introduction effect (with a decay period that could be estimated), a Program effect (not enforcement related), and the effects of ongoing enforcement (with provision for lagged effects of different durations representing "residual deterrence"). The major recommendation is that all states should increase highly visible stationary RBT to a level equivalent to one test per licence holder per year. This could be accomplished in a cost effective manner by using general duties police and highway patrol vehicles, and by utilising the management techniques embodied in the random roadwatch program. (A)
Abstract