The　chevron　alignment　sign　is　an　important　element　of　curve　delineation　devices.　It　mainly　allows　for　better　visibility　when　approaching　a　curve　and　provides　positive　guidance　while　navigating　through　a　curve.　However,　little　research　has　been　conducted　in　China　to　study　its　effects　on　drivers＇stress.　This　current　study,　based　on　a　driving　simulator　experiment,　focused　on　testing　the　effectiveness　of　chevron　alignment　signs　on　driver　stress.　Meanwhile,　researchers　also　tested　to　see　whether　the　function　of　chevron　signs　on　driver　nervousness　was　affected　by　curve　roadway　geometry　(i.e.,　curve　direction　and　curve　radius).　Thirty　drivers　participated　in　the　experiment.　Heart　rate　data　and　their　subjective　feelings　were　collected　through　an　AKF2　dynamic　multi-parameter　physiological　recorder　and　through　their　verbal　reports,　respectively.　The　scenarios　used　in　this　experiment　consisted　of　twelve　different　horizontal　curves　with　combinations　of　chevrons　presence,　curve　radius　and　curve　direction.　The　results　showed　that　drivers＇stress　tended　to　be　at　a　lower　level　in　a　sharp　radius　curve.　Thus,　their　heart　rate　was　relatively　low　when　chevrons　were　presented　and　the　drivers＇perceived　safe　speed　was　higher.　However,　with　an　increase　in　the　curve　radius,　the　result　was　opposite.　Therefore,　the　effect　of　chevrons　was　significant　in　a　sharp　curve　and　decreased　with　an　increase　in　the　curve　radius.　©　2014　American　Society　of　Civil　Engineers.