Based　on　a　regression　analysis　of　field　test　data　obtained　from　provincial　Highway　203,　the　correlations　of　speed　standard　deviation　and　traffic　conflicts　along　two-lane　highways　were　determined　in　this　paper.　The　relations　of　speed　standard　deviation,　strength　of　traffic　conflicts,　and　traffic　accident　rate　are　analyzed,　and　their　internal　relations　are　established　theoretically.　The　results　show　that　there　is　a　remarkable　correlation　between　speed　standard　deviation　and　strength　of　traffic　conflicts　on　two-lane　highways.　Among　the　diversified　regression　models　used,　the　correlation　coefficient　of　the　polynomial　regression　model　is　the　highest.　©　2013　American　Society　of　Civil　Engineers.