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Early on in the research project, a decision was made to decompose roundabouts into symmetrical and repeating sections for use as units of analysis. There are several reasons for this:  \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 as a whole  very complex. Instead, a smaller number of measures are chosen to describe a larger number of repeating design elements found at each branch, for example: number of approach lanes. \item There are \textbf{practical limitations} to performing video data collection covering the entire roundabout.  \item Roundabouts are large enough that they can and often do contain \textbf{multiple independent road user interactions simultaneously}. For example, a motorist approaching the roundabout depicted in Figure~\ref{fig:roundabout-quadrants} from the North-West section can do so independently of any movement occurring inside of the South-East section. This is not strictly true for all interactions however; particular care should be taken at the transitionary zone between sections.  \end{itemize}