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\subsection{Data Size}  Video was collected at 20 roundabouts using two types of camera, a security camera VIVOTEK with a narrow lens filming at 15 frames per second at a resolution of 800*600 and a consumer camera GoPro 2 with a wide-angle lens filming at 30 frames per second at a resolution of 1280*960. The cameras are mounted on a specially constructed mobile video-data collection system built for temporary, high-angle video data collection, with tamper-proof, weather-proof, self-contained features presented in \cite{Jackson_2013}.  In these 20 roundabouts, video was recorded for 40 merging zones of varying lane configuration, geometry, land use, and traffic volumes across the province of Qu{\'{e}}bec. Québec.  The merging zone of the roundabout is defined as the portion of the ring intersected by an approach and an exit. There is generally one merging zone between every pair of adjacent branches. Video data at each site was taken on one mild summer workday from 6 AM to 7 PM or 10 PM and captures both peak traffic hours \cite{St_Aubin_2013}. This yields a total of 600 hours of video data, 50~\% of which has been fully processed at this time (see Table~\ref{tab:data_details} for more information). \begin{table}  \caption{Data details}