HighlightsConverting 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.
Road safety effects of roundabouts: A meta-analysis
Accident Analysis and Prevention ; 99 ; 364-371
2016-12-25
8 pages
Article (Journal)
Electronic Resource
English
Road safety effects of roundabouts: A meta-analysis
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