Safety Effectiveness of Speed Reductions: A Queensland Experience

Previous Queensland Department of Transport and Main Roads (TMR) studies on the effect of speed reductions on crashes have demonstrated promising results for both high and low speed road environments. Recent analysis in Queensland by TMR has shown that a 10km/h reduction in posted speed limit can reduce casualty crashes by up to 39% in high speed environments and 26% in lower speed environments. This paper shares the learning of Queensland speed reduction initiatives, provides a brief review of the available guide for speed reductions, and suggestions to improve the existing guidelines.