United States Department of Transportation
i
Safety Evaluation of Roundabouts in Georgia
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2018-08-01
[PDF-962.92 KB]
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Edition:Final Report
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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 injury/fatal 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 injury/fatal 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 injury/fatal 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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