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A sample of road user trajectories as they are tracked in image space is presented in Figure~\ref{fig:conflict-video}. For more information on computer vision, see section \ref{software}.  \subsubsection{Derived Data: Velocity & \&  Acceleration} Velocity and acceleration measures are derived through differentiation from position and velocity over time respectively. These are 2-dimensional vectors with a magnitude (speed and acceleration) and a heading. The heading of the velocity vector is typically used to determine the orientation of the vehicle.