Objective:　The　aim　of　this　article　is　to　explore　the　detailed　characteristics　of　steering　behavior　in　curve　driving　at　different　alcohol　dosages.　Background:　Improper　operation　of　the　steering　wheel　is　a　contributing　factor　to　increased　crash　risks　on　curves.　Method:　The　experiments　were　conducted　using　a　driving　simulator.　Twenty-five　licensed　drivers　were　recruited　to　perform　the　experiments　at　the　four　different　breath　alcohol　concentration　(BrAC)　levels.　The　steering　angle　(SA),　steering　speed　(SS),　steering　reversal　rate　(SRR),　and　peak-to-peak　value　of　the　steering　angle　(PP)　were　used　to　characterize　the　steering　behavior.　The　vehicle＇s　speed　and　the　number　of　lane　exceedances　per　kilometer　were　also　used　to　examine　the　driving　performance.　Results:　The　SSs　on　the　200　m　(chi(2)(3)　=　20.67,　p　＜　.001),　500　m　(chi(2)(3)　=　22.42,　p　＜　.001),　and　800　m　(chi(2)(3)　=　22.86,　p　＜　.001)　radius　curves　were　significantly　faster　for　drivers　under　the　influence　of　alcohol　compared　with　those　given　a　placebo.　There　were　significant　effects　of　alcohol　on　the　SRR　and　PP　on　the　200　m,　500　m,　and　800　m　radius　curves.　Conclusion:　For　all　of　the　curves,　the　SS,　SRR,　and　PP　had　a　tendency　to　increase　as　the　BrAC　increased.　The　large　PP　at　a　high　BrAC,　accompanied　by　the　high　speed,　SS,　and　SRR,　resulted　in　a　high　probability　of　lane　exceedance.　The　use　of　measures　of　SS,　SRR,　and　PP　aided　in　the　improvement　of　the　accuracy　of　the　intoxication　detection　for　the　different　types　of　curves.　Application:　The　most　important　application　is　to　provide　guidance　for　detecting　alcohol-impaired-driving.