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Paul St-Aubin edited Conclusion.tex
almost 10 years ago
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\section{Conclusion}
This research looked at two indicators of traffic behaviour---speed and time-to-collision---associated with road safety (collision severity and collision probability) for 37 weaving zones at 20 roundabouts in the province of Quebec. Random effect regression was used to perform a disagregated behaviour regression across 37 groups over nearly 80,000 observed vehicles, one of the largest applications of surrogate safety indicators to date.
Direct regression of factors suggest that the number of exits and that the width of the appron have a significant negative effect on driving speed within the weaving zone, while more obvious factors, such as roundabout diameter and flow ratio do not have an effect. Flow ratio is found to have an important effect on time-to-collision however, for evenly mixed flow ratios produce the most complex traffic conflicts.
Traffic circle conversions are found to be associated with the highest speeds. Surprisingly, roundabouts in residential areas on collector streets are associated with higher speeds and TTC in the weaving zone. This may be explained by low flows overall and drivers accustomed to not having to yield.
While this research provides some important insight into traffic behaviour at North American roundabouts, it is not yet complete. The time-to-collision indicator still needs more validation so these results will need to be revisted for better intepretation regarding sdafety.
