Safety effectiveness of converting signalized intersections to roundabouts

► We estimated the safety effects of converting signalized intersections to roundabouts. ► Roundabouts have fewer conflict points than similar signalized intersections. ► Converting signalized intersections to roundabouts tends to reduce crash frequency. ► Converting signalized intersections to roundabouts tends to reduce crash severity. ► Results may vary by traffic volume, area type, and number of approaches and lanes.