To determine the risk factors associated with traffic violations and injury severity, the dependent variables are set as follows: (a) whether there was any traffic violation—‘1’ = yes and ‘0’ = no; (b) whether the accident resulted in a serious injury/fatality—‘1’ = yes and ‘0’ = no. As the outcome measure is either 0 or 1, a logistic regression model can be used to estimate the effect of the risk factors on the probability of (i) traffic violation; and (ii) fatal/serious injury in an accident. Although binary logit model is the most common method to analyze injury-severity outcomes, ordinal discrete outcome model is a viable alternative when injury data are of ordinal type (Savolainen et al., 2011). In current study, for the ease of interpretation of results and the sake of devising corresponding local road safety programs, injury severity is classified into two groups according to fatal/serious injury or not. The risk factors that were considered include the following: human, vehicle, road and environment.