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\subsubsection{Interactions}  An interaction quantifies the spatial relationship between moving objects in a scene, as is depicted in Figure~\ref{fig:conflict-video}. At the most fundamental level, an interaction is defined as a pair of moving objects simultaneously present in a scene over a common time interval (also referred to as a user pair). We further define an instantaneous observation (i.e. in a give given  video frame) within this time interval as an interaction-instant. This interaction definition is generic, if not naive, as the quality depends largely on how the scene is constructed. For example, the significance of an interaction between two vehicles separated from each other physically (e.g. via a median or a large building) may not be comparable to an interaction between two vehicles merely separated by a painted line because the probability that one of the vehicles comes into contact with the other vehicle is reduced in the case of the median. This may interfere with collision prediction attempts, particularly if scenes are not consistently selected and geometry is not controlled.