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Paul St-Aubin edited section_Conclusion__.tex
about 7 years ago
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\section{Conclusion}
In this paper, a highly detailed, international comparison of roundabout merging zones is performed for the purpose of identifying road user behaviour factors that might explain regional discrepancies in road safety. The same effects on road safety between the two regions are observed consistently across a wide range of measures, reflected in the \glspl{SSM} of speed, \gls{YPET}, and \gls{TTC}, and this after controlling for a number of road geometry, land use, traffic composition, weather and climate conditions, temporal effects, and traffic exposure factors. This leaves a latent, unobserved component of \gls{road_user_behaviour} that might be affected by road culture. Whether this culture is shaped by collective trends in education, enforcement, or design policy, i.e. ``culture'', remains to be seen, but it seems clear that \gls{road_user_behaviour} is shaped by more than site-based effects.
Furthermore, these observations are consistent with both the macroscopic and microscopic \gls{historical_accident_a}. Although a more thorough statistical analysis will be necessary to answer this hypothesis more conclusively, the consistency of \glspl{SSM} observations and interpretations, as well as consistency of these measures with the limited sample of \glspl{historical_accident_d}, gives validity to the claim that \glspl{surrogate_safety_meth} can be substituted for \gls{historical_accident_a}.
One small limitation of this study, however, is that while the sample of Québec \glspl{roundabout} is regionally representative of most of the province of Québec, the \glspl{roundabout} sampled in Sweden were limited to the city of Lund. However, this limitation applies only in the situation where the \gls{road_user_behaviour} differences within Sweden are greater than those expected between Europe and North America as a whole. In fact, the opposite is assumed.
