“…Road infrastructure and traffic volume have dramatically increased over the past decades in many countries, resulting in a considerable increase in traffic crashes (Saenghaengtham and Kanongchaiyos, 2006;Hu et al, 2008;Jin et al, 2011;Luoma and Sivak, 2012;Li et al, 2012;2014;Ma et al, 2012;Jin et al, 2013). An analysis on crash frequency can identify factors that affect the crashes to help reduce the number of crashes.…”