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% \end{tabular}  %\end{table}  This regression model offers relatively good explanatory power. The coefficients and statistical test results are provided in Table~\ref{tab:re_speed_regression} Table~\ref{tab:re_speed_regression}.  All but cluster c6\_s (2-lane arterials) provides moderate to very strong statistical significance. Cluster c1\_s (single-lane residential arterial) is associated with the lowest speeds. From the cluster characteristics, we gather that high and moderate flow ratios have an important effect of increasing speed. Unsurprisingly, the highest speeds attributed to regional highway roundabouts. Large-diameter, 2-lane, roundabout-converted traffic circles had the poorest speed results, probably because the approach angle remained tangential to the circle instead of the usual mostly orthogonal approach of smaller roundabouts. Interestingly, roundabouts situated in residential neighbourhoods on collector streets (cluster c4\_s) were associated with higher speeds than highway ramps (cluster c3\_s), despite the smaller size. This may be attributed to significantly lower flows and thus fewer conflicts. \begin{table}  \caption{Random effects speed regression}