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A data set of video was collected at 19 roundabout merging zones of varying lane configuration, geometry, land use, and traffic volumes across the provence of Québec. Video data at each site was taken on a mild summer workday from 6 AM to 7 or 10 PM and captures both peak hours. \cite{St_Aubin_2013}  \subsection{Sample Analysis} Analysis of a Single User Pair}  A sample analysis for a single pair of road users at a single site over a timeseries of 64 interaction-instants, lasting just over 4 seconds is presented in Figure~\ref{fig:conflict-video} and Figure~\ref{fig:conflict-series}. In this scenario, vehicle # 304 is approaching at high velocity vehicle # 303 which is enganged in an illegal u-turn (in a right-hand roundabout, users are supposed to travel counter-clockwise around the center island at all times). The differential velocity $\Delta v$, realtive distance $d$, and corresponding time $t$ is measured for every interaction-instant. In a matter of just under 4 seconds, the differential velocity changes from 9.63 m/s to 2.26 while the relative distance changes from 28.57 metres to 9.57 metres. For every interation-instant of this user pair, motion prediction is used to calculate resulting TTC under each motion prediction's respective hypothesis. These predicted collisions and associated TTC measures are presented in Figure~\ref{fig:ttc-timeseries}. Motion pattern prediction generates many more possible collision points than constant velocity prediction, though each of these points has a significantly lower associated probability. For beterr instant-to-instant comparison, a summary $TTC'_i$ at time $t_i$ is calculated as the probability-weighted TTC average