United States Department of Transportation
i
Safety Evaluation of Roundabouts in Georgia
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2018-02-02
[PDF-2.30 MB]
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Abstract:Several previous studies have documented significant safety benefits of roundabouts in the United Sates. However, the safety benefits for a given roundabout may vary depending on factors such as the familiarity of the driving population to roundabout operation, site-specific geometric features, weather conditions, etc. To help inform GDOT’s roundabout implementation investment decisions, the current study provides a safety evaluation of 27 Georgia roundabouts. A time-dependent form of the Highway Safety Manual predictive (empirical Bayes) method was used to estimate potential crash reductions across all crashes and all fatal and severe injury crashes. The findings provide further evidence that roundabouts are an effective crash countermeasure. Specifically, the results show the following crash reductions: (a) A 37 to 48 percent reduction in average crash frequency for all crashes and a 51 to 60 percent reduction in average crash frequency for fatal and severe crashes at four-leg roundabouts converted from stop-controlled and conventional intersections. (b) A 56 and 69 percent reduction in average crash frequency for all crashes and fatal and severe injury crashes, respectively, at three-leg and four-leg roundabouts converted from stop-controlled and conventional intersections. The study did not consider five-leg roundabouts due to small sample size and concerns about the form of the SPF.
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