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A number of roundabout safety studies have been performed throughout Europe.  In the netherlands, for example, one study found a decrease in casualty rate across 46 roundabout conversions of up to 74\% \cite{Schoon_1994} (though admitedly the rates were small to begin with). A more recent example in Denmark important shows reductions in accident rates and accident severity across a large data set, though it also suggests that roundabouts have the least effect on mitigating property-damage-only (PDO) collisions \cite{Jensen_2013}. This study also looked at contributing factors and recommends tapered central isalnds above instalations without elevated islands or with cylindrical islands. Finally, it notes that cyclist collisions increased over the same period.  \subsection{Roundabout Safety Studies in North America}  Experience and research in this area North America  is still lacking, though some efforts have nervertheless been undertaken. One study found a decreases in collision severity, particularly for fatal collisions using an empircal Bayes model on 24 stop-controlled intersection conversions into roundabout \cite{Persaud_2001, Rodegerdts_2007}. A more recent, but similar study founds essentially the same result across 28 sites in the same region \cite{Gross_2013}. \subsection{Behavioural and Surrogate Safety Analysis}