In　this　paper　a　study　is　presented　to　use　a　driving　motion　capture　system　to　capture　and　interpret　driving　motion　for　a　better　understanding　of　driver　behaviors　which　is　crucial　to　highway　traffic　safety.　The　impetus　to　do　this　research　is　triggered　by　the　prevalent　success　of　a　motion　capture　system　in　other　areas　such　as　computer　3D　animation,　bio-mechanics　and　athletic　sports　analysis.　Driving　motion　capturing　is　a　process　to　record　and　track　drivers＇　body　movements　and　obtains　their　motion　parameters　in　a　three-dimensional　space.　The　established　driving　motion　database　through　the　capturing　system　can　be　used　to　analyze　the　impacts　of　human　fatigue　and　alcohol　on　their　driving　performance　under　varying　traffic　conditions.　©　2012　IEEE.