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\subsection{Roundabout Safety Studies in North America}  Experience and research in 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 found  essentially the same result across 28 sites in the same region \cite{Gross_2013}. \subsection{Behavioural and Surrogate Safety Analysis}