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An example of the analysis area is demonstrated in Figure~\ref{fig:complex-network}.  \subsubsection{Alignments}  \label{alignments}  Trajectory clustering is the first step in scene interpretation. Trajectory clustering is an abstract representation of movements along prototypical paths through a scene, called alignments. This is the foundation for relating spatial position with road geometry and, in particular, position of moving objects in relation to lanes and sidewalks. The alignment is represented as a simple series of points with a begining and end, typically in the same direction is the majority of flows along this path. This process introduces a new coordinate system which maps a position of a moving object in cartesian space to a position in curvilinear space