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AJPH First Look, published online ahead of print Jul 31, 2007
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Reducing Road Traffic Injuries: Effectiveness of Speed Cameras in an Urban Setting

Katherine Pérez, PhD, Marc Marí-Dell’Olmo, MPH, Aurelio Tobias, PhD and Carme Borrell, PhD

Katherine Pérez and Marc Marí-Dell’Olmo are with the Agència de Salut Pública de Barcelona, CIBER Epidemiología y Salud Pública, Barcelona, Spain. Aurelio Tobias is with the Escuela Nacional de Sanidad, Instituto de Salud Carlos III, Madrid, Spain. Carme Borrell is with the Agència de Salut Pública de Barcelona, CIBER Epidemiología y Salud Pública, Barcelona, and the Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona.


Figure 1
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  		FIGURE 1—— Monthly subseries time trends in numbers of road traffic collisions occurring on the beltway (a) and arterial (b) roads: Barcelona, Spain, January 2001–March 2005.

 

Figure 2
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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.

 




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