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\subsubsection{Analysis Area}  The analysis area is a bounding box polygon  which confines analysis to a particular region of the scene. This serves to i) reject areas of the image with unsatisfactory feature tracking (particularly at the edges of the video), and ii) confine analysis to a particular region. For a cross-sectional or before-after study, analysis areas should conform  to the same region of the roadway as much as possible. The %The  analysis area differs from a mask used during feature tracking which instructs the computer vision to ignore certain portions of the image. Feature tracking which uses a mask is still prone to "warm-up" tracking errors at the edge of the mask. An example of the analysis area is demonstrated in Figure~\ref{fig:complex-network}.  \subsubsection{Alignments}