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\section{Experimental Results}  A set of video data \subsection{Tracking calibration}  \label{tracking_calibration}  Tracking accuracy  was collected at 20 roundabouts, 40 merging zones evaluated by way  of varying lane configuration, geometry, land use, and traffic volumes across Measures Of Tracking Accuracy (MOTA) \cite{ettehadieh15systematic} using as ground truth manually annotated trajectories with  the province annotation tool \href{http://www.jpjodoin.com/urbantracker/index.html}{Urban Tracker} \cite{Jodoin_2014}. Nearly 40,000 manually annotated observations  of Qu{\'{e}}be. The merging zone 371 motor vehicles were performed across two prototypical sample sites: one site where objects were tracked at a distance  of between 20 and 50 meters away from  the roundabout is defined as camera and one site where objects were tracked at a distance no greater than 20 meters away. An initial MOTA was calculated for default tracking parameters and offered modest accuracy (in  the portion neighbourhood  of $70\%$). A tracking optimisation was then performed using a genetic algorythm to search for parameters that maximised MOTA. After optimisation, accuracy increased up to $94\%$. These statistics are summarised in Table~\ref{tab:track_calib_data}. Tracking parameter optimisation converged in less than 24 hours.  Of important note is  the ring intersected by an approach and an exit. Video data at each site fact that this calibration  was taken performed  on an average summer workday each from 6 AM the oldest and poorest quality video data (resolution of $800\times 600$, without software-assisted image stabalisation, and before lens correction). Tracking results are expected  to 7 PM or 10 PM increase with increases in quality of the video data  and captures both peak traffic hours. \cite{St_Aubin_2013} video pre-treatment. The optimized tracking parameters should be portable to other sites with similar view and camera characteristics, though this will be investigated further and the subject of of a future paper in depth.  \begin{table}  \caption{Tracking Calibration Results}  \label{tab:track_calib_data}  \begin{tabular}{lllll}  \hline  \textbf{Site} & \textbf{Ground Truth Objects} & \textbf{Ground Truth Observations} & \textbf{Unoptimised MOTA (Default Parameters)} & \textbf{Optimised MOTA} \\  \hline  12 (far camera) & 146 & 12887 & 0.685 & 0.944 \\  16 (near camera) & 225 & 25011 & 0.744 & 0.853 \\  \end{tabular}  \end{table}  \subsection{Data Size}