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FIGURE 2—— Monthly numbers of observed and expected road collisions on the beltway (a) and arterial (b) roads: Barcelona, Spain, January 2001–March 2005.

Note. n = number of road collisions each year. Confidence intervals (CIs) refer to expected road collisions. We controlled for trends and seasonality using time-series analysis with Poisson regression models.

^a2005 includes January 1 through March 31.