While　investigating　Jingjintang　Expressway＇s　traffic　accidents,　it　is　clear　that,　crash　frequency　and　rates　at　interchange　areas　are　more　severe　than　that　at　other　locations.　To　further　explore　the　relationship　between　crash　rates　and　characteristics　of　freeway　geometric　design　features,　this　study　analyzed　the　existing　safety　problems　at　Jingjintang　Expressway＇s　interchanges.　Particularly　we　examined　crash　characteristics　at　ramps　including　length　of　acceleration　lanes　and　deceleration　lanes,　ramp　geometric　design,　traffic　control　devices　at　ramps　and　locations　of　toll　plazas.　The　driver　behavior　and　performance　of　overloaded　trucks　on　ramps　were　also　studied.　The　results　of　the　study　have　clearly　shown　that　it　is　important　to　have　a　uniform　traffic　information　system　and　a　consistent　traffic　control　system.　Most　importantly,　the　study　has　concluded　that　the　length　requirements　in　our　current　design　specification　for　ramp　acceleration　and　decoration　lanes　are　not　sufficient　for　safety,　particularly　for　large　vehicles.　A　set　of　recommendations　are　made　as　a　result　of　this　study.　Copyright　ASCE　2008.