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Paul St-Aubin edited Methodology.tex
almost 10 years ago
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Early on in the research project, a descision was made to 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.
\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 transitionary zones.
\end{itemize}