An effective road safety management requires a good insight into the factors that are believed to be related to
road traffic accidents. Based on this framework, several research studies have been conducted over the years aiming
at identifying factors that may influence both the frequency and the severity of road traffic accidents. However, as
pointed out by Savolainen et al. (2011), one has to be aware that the factors influencing accident frequency may
vary from the ones affecting the severity; hence, it is suggested that their analysis should be performed individually.