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\section{Methodology}  \subsection{Scope}  Early on in the research project, a descision was made to deconstruct roundabout geometry decompose roundabouts  into symetrical and repeating sections. There are several reasons for this: \begin{itemize}  \item Roundabout \textbf{branches vary in the 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.