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\section{Conclusion}  In this paper, a highly detailed, detailed  international comparison of roundabout merging zones zone behaviour  is performed for the purpose of identifying road user behaviour factors that might aiming to  explain regional discrepancies in roadsafety. The same effects on road  safety between using collision course modeling and surrogate safety measures. Conclusions derived from  the two regions surrogate safety measures of: speed, yielding post-encroahcment time, and time-to-collision  are found to be consistent among each other as well as with  observed consistently across a wide range of measures, reflected discrepancies  in the \glspl{SSM} national historical records  of speed, \gls{YPET}, and \gls{TTC}, and this road safety  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} road user behaviour  that might be affected by local  road culture. use norms.  Whether this culture behaviour  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} road user behaviour  is shaped by more than site-based site-specific  effects. Furthermore, Limited historical accident data was also available at individual sites and would seem to suggest that  these observations effects present at the selected sites  are generally  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 national historical records  of \glspl{SSM} observations and interpretations, road safety  as well as consistency of these measures the conclusions drawn from the studied surrogate safety measures. However, given the issues  with this localised accident data set, this last observation remains, for  the limited sample time being, inconclusive, prompting further investigation. In general, a more thorough statistical analysis using larger sets  of \glspl{historical_accident_d}, gives validity to the claim that \glspl{surrogate_safety_meth} can localised accident data will  be substituted for \gls{historical_accident_a}. beneficial in further solidifying conclusions drawn from surrogate safety measures.  One small other  limitation of this study, however, study  is that that,  while the sample of Québec \glspl{roundabout} is roundabouts can be considered to be  regionally representative of most of the province of Québec, the \glspl{roundabout} roundabouts  sampled in Sweden were limited to all located in  the same  city of Lund. However, this This  limitation applies only in the situation where the \gls{road_user_behaviour} differences within Sweden are greater is of greatest concerns when road user behaviour varies \textit{within} regions (such as Sweden) more  than those expected \textit{between} regions (such as  between Europe and North America America)  as a whole. In fact, the opposite is assumed.