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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 found essentially the same result across 28 sites in the same region \cite{Gross_2013}. Meanwhile, closer to Québec, Burns found that large passenger vehicles, multiple vehicles, and night time was associated with increased accident severity \cite{Burns_2013}.  \subsection{Behavioural and Surrogate Safety Analysis} Studies}  Roundabout speed is consistently measured around 30 km/h in the literature \cite{Chen_2013}. In fact, it has been observed that, while high-speed areas typically have their speed decreased to 30 km/h after implementation of a roundabout, areas with lower speeds (e.g. 20 km/h) can have their speed increase to 30 km/h as well \cite{Hyd_n_2000}. This effect has been confirmed to occur at the microscopic level in Québec \cite{St_Aubin_2013}.