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\begin{itemize}  \item Roundabout \textbf{branches vary in number} (between two and six, with a median of four branches) and branches can vary greatly in geometry even among branches of the same roundabout, which makes detailed description of the entire roundabout very complex. Instead, a smaller number of measures are chosen to describe a larger number of reapeating design elements found at each branch, for example: number of approach lanes.  \item There are \textbf{practical limitations} to performing video data collections across the entire roundabout.  \item Roundabouts are large enough that they can and often do contain \textbf{multiple independant road user interactions simultanously}. For example, a motorist approaching the roundabout depicted in Figure~\ref{fig:roundabout-quadrants} from the North-West section can do so independantly of any movement occuring inside of the South-Eeast section. This isn't strictly true for all interactions however; particular care should be taken at section the  transitionary zones. zone between sections.  \end{itemize}  These sections are termed \textit{quadrants} as they cut the most-common configuration of roundabout, a four-way roundabout, into four sections using two axes of similtude. Though other configurations do exist, the general principle still applies: a quadrant is the section of a roundabout delimited by an approach and the next immidiate exit, bounding a central weaving zone (depicted in Figure~\ref{fig:roundabout-weaving-zone}) where the most complex motorist and cyclist interactions are expected to occur. Pedestrian-motorist interactions are expected at crosswalks across each approach and exit, but because these movements are protected by median, they can be bounded by the same quadrant.