Paul St-Aubin edited Results Sample HLI.tex  almost 10 years ago

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Some high-level interpretation measures are also compiled using the data sample. Figure~\ref{fig:speed_profile} shows the mean and $\pm$ one standard deviation speed profiles through the roundabout merge zone of the same 20 samples. Speed profiles are mapped, not as a unit of distance, but rather as a unit of curvilinear location relative to the start and end of the merge zone. This is done to account for the large variability in diameter of roundabouts across the samples. The re-sampling method as described in section \ref{method-size_of_data} is used here to ignore oversampling bias from varying speed between road users. Mean speeds are generally consistent with those in the literature, but variation does occur by relative location and movement type. In addition, cross-sectional analysis uncovers even larger variations (not shown).  Finally, Figure~\ref{fig:hli_histos} demonstrates gap acceptance time distributions of approaching vehicles and corresponding roundabout vehicles. In a cross-sectional analysis, this quantifies vehicle insertion aggressivity. Smaller accepted gaps might be explained by more impatient drivers, typically symptomatic of high-volumes of continuous flow inside the roundabout and long wait times at the approach. Figure~\ref{fig:hli_histos} also Figure~\ref{fig:hli_sequential}  demonstrates platoon sizes. sizes (uninterupted passage of sequential vehicles).  Users already inside the roundabout are generally more clustered than users entering the roundabout from the approach.