The　freeways　crossing　mountainous　areas　in　China　are　playing　a　major　role　in　economic　development.　In　the　past　decade,　building　freeways　in　these　regions　have　greatly　stimulated　economic　development　in　all　aspects　and　will　also　be　a　major　factor　in　the　areas＇　sustainable　development　for　the　future.　Due　to　the　geometry　of　highways,　freeway　accidents　have　become　a　serious　problem　in　these　mountainous　areas.　This　paper　focused　on　the　modeling　of　freeway　safety　with　the　consideration　of　geometry,　traffic　flow,　and　roadside　environment.　Particularly,　the　generalized　regression　model　was　developed　based　on　the　data　collected　from　the　mountainous　areas.　©　2010　ASCE.