Road safety effects of roundabouts: A meta-analysis

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Road safety effects of roundabouts: A meta-analysis

Elvik, Rune

Highlights•Converting junctions to roundabouts improves road safety.•Fatal accidents are reduced by 60–60%.•Injury accidents are reduced by 35–45%.•Effects on property-damage-only accidents are ambiguous.

AbstractThis paper presents a meta-analysis of the road safety effects of converting junctions to roundabouts. 44 studies containing a total of 154 estimates of effect were included. Based on a meta-regression analysis, converting junctions to roundabouts is associated with a reduction of fatal accidents of about 65% and a reduction of injury accidents of about 40%. The mean effect on property-damage-only accidents is ambiguous. Summary estimates of effect are robust for fatal and injury accidents, but vary depending on the model of meta-analysis and the treatment of outlying data points for property-damage-only accidents. A trim-and-fill analysis suggests a weak tendency for publication bias, with modest influence on summary estimates of effect. It is concluded that roundabouts are very effective in reducing traffic fatalities.