To　develop　a　scientific　and　practicable　guideline　for　implementing　warning　piles　on　Chinese　low-grade　highways,　it　is　necessary　to　study　the　effect　of　warning　piles　on　driving　performance　in　different　road　alignments　and　environments.　Based　on　a　driving　simulator,　this　paper　evaluates　the　effect　of　unilateral　and　bilateral　warning　piles　on　vehicle　speed　and　lateral　position　on　a　two-lane　rural　highway　curve　with　different　road　geometries.　The　results　show　a　significant　effect　of　bilateral　warning　piles　on　speed　control,　which　becomes　more　obvious　as　the　radius　of　the　curve　decreases　and　the　superelevation　increases.　In　sharp　curves,　vehicle　speed　increases　rapidly　in　the　second　half　of　the　curve,　and　bilateral　warning　piles　could　significantly　control　speed　increase　to　prevent　danger.　Meanwhile,　the　effect　of　bilateral　warning　piles　on　keeping　vehicles　in　a　safer　lane　position　is　also　statistically　significant　in　the　second　half　of　the　curve.　With　a　decreasing　radius　and　an　increasing　superelevation,　the　value　of　the　maximum　lateral　position　will　increase.　Bilateral　warning　piles　could　reduce　the　lateral　position　to　keep　the　vehicle　on　a　stable　track.　Moreover,　bilateral　warning　piles　could　also　perform　better　at　night.　This　paper　studies　both　unilateral　and　bilateral　warning　piles＇　effects　on　driving　behavior　in　different　road　geometries,　thus　providing　a　theoretical　basis　for　the　engineering　application　of　warning　piles.