From 2005 2015, Iran has experienced a 41.3 decrease in road fatalities and an 11.1 increase in non fatal injuries. However, the trend differs across Iran provinces, and hence identifying factors that relate to road fatality and injury counts is an essential tool for improving road safety management programs and policies in the provinces. In this study, a statistical model was developed within a Bayesian framework with the aim of examining the annual fatal and non fatal injury counts in the provinces of Iran during the period 2005 2015. ...