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\label{data-size}  Video data was collected at 37 different merging sections of varying geometrical configuration across 20 different roundabouts with varying land-use across the province of Québec. Video was shot using a purpose-built mobile video-data collection system designed for temporary, high-angle video data collection, with tamper-proof, weather-proof, self-contained cameras mounted on a 3.5 to 10.5-metre pole \cite{Jackson_2013}.  At these 37 merging zones (the study sites), video data was recorded for varying lane configuration, geometry, land use, and traffic volumes. The merging zone of the roundabout is defined as the portion of the ring intersected by an approach and the next exit, and the area proper is the area where the approach and exit lanes overlap with the ring. There is generally one merging zone between every pair of adjacent branches, unless one of these branches does not have an approach (these are rare and not included in the study). Video data at each site was taken during one mild summer workday from 6 AM to 7 PM or 10 PM and captures both peak traffic hours though most of the roundabouts experienced saturation  \cite{St_Aubin_2013}. See Table~\ref{tab:data_details} for details. \begin{table}  \caption{Data details}