Paul St-Aubin edited Results Motion Prediction.tex  over 9 years ago

Commit id: ac0036c0ebd8a3dc08326a84e3146a8b03bf5da2

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% paul: the merging zone as a unit of analysis is not well defined. Add a figure if we have enough space  % paul->Nicolas: added a definition at the beginning of the section.  Figure~\ref{fig:ttc_distro_sample} %Figure~\ref{fig:ttc_distro_sample}  demonstrates a cross-sectional comparison of TTC distributions based on motion prediction at constant velocity for 20 merging zones for two contributing factors, each using all interaction instants. Kolmogorov-Smirnov tests are performed between the distributions to quantify non-parametric dissimilitude. In the first diagram, a cross-sectional comparison is made for merging zones situated nearer or further than 300 metres upstream from another intersection. When this distance exceeds 300 metres, the distribution mass appears to shift left except for a sharp increase in small TTC below 0.5 seconds. It is so far unknown whether this small concentration of low-TTC conflicts offsets all other increases in TTC. This comparison remains therefore inconclusive. In the second diagram, a cross-sectional comparison is made between merging zones with high approach traffic volume ratios and low approach traffic volume ratios, where $R$ is the flow ratio between approach volumes and total volumes at the merging zone. In this comparison, a clear and consistent mass shift is observed, suggesting that high approach traffic volume ratios contribute to safer merging behaviour in a roundabout. % paul: When this distance exceeds 300 metres, the distribution mass appears to shift left -> right ?  % paul->Nicolas: Not entirely. There is a sharp increase in the 0-0.5 range, small number of possibly "severe" conflicts. Conclusion is therefor inconclusive.