In addition to road and transport infrastructure, Kim et al. ( Using data for 2010 and a variety of econometric techniques, including oidinaiy least squares and spatial error models, they consider factors that affect the total number of the accidents in a TAZ. In additioa they consider separately factors that are associated with accidents that caused severe injuries (requiring more than three weeks of hospitalisation) or deaths, and factors associated with accidents that resulted in light injuries (three or fewer weeks of hospitalisation).