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\subsection{Computer Vision in Traffic Applications}
Computer vision is used extensively in traffic applications as an instrument of data collection and monitoring. The two primary branches of computer vision in traffic applications include presence detection (sometimes referred to as virtual loops) and
feature tracking. Presence detection has widespread commercial application due to its
has a relatively high degree of
reliability; reliability, on par with more common sensors such as inductive loops; its primary application is in providing traffic counts, queue lengths, and basic presence detection.
Feature tracking Tracking is a more complex application which
tracks moving features aims to extract the road users' trajectories within
the camera
space continuously, providing accurate measures field of
position, velocity, view, from which velocity and acceleration
over time, but may be derived: it is
therefore generally less reliable than presence detection systems. The NGSIM project was one of the first large-scale video data collection projects making use of semi-automated vehicle tracking from freeway and urban arterials video data to obtain vehicle trajectories for traffic model calibrations \cite{Kim_2005}. Surrogate safety analysis also makes use of
extensive trajectory data, for example with the early SAVEME project \cite{Ervin_2000,Gordon_2012}, and now more recently with extensive
research open source projects such as
Traffic-Intelligence Traffic Intelligence \cite{saunier06feature-based,Jackson_2013}.
\subsection{Tracking Optimisation}
\cite{Ettehadieh_2014}