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\subsubsection{Data Collection}  Video data collection is primarily  performed using a specially constructed mast mobile video-data collection system  built for temporary, high-angle video data collection and has tamper-proof, weather-proof, self-contained features presented in \cite{Jackson_2013}. Ordinary fixed traffic surveillance CCTV cameras can be used as well and are usually more reliable, but only where and when available.  \subsubsection{Camera types}