Abstract　This　paper　investigates　the　modal　split　and　trip　scheduling　decisions　with　consideration　of　the　commuters＇　uncertainty　expectation　in　the　morning　commute　problem.　Two　physically　separated　modes　for　transportation,　the　auto　mode　on　highway　and　the　transit　mode　on　subway,　are　available　for　commuters　to　choose　for　traveling　from　home　to　workplace.　The　travel　time　uncertainty　is　assumed　to　only　occur　on　highway.　Every　commuter　is　faced　with　the　joint　choice　of　transport　mode　and　trip　scheduling　for　minimizing　her/his　generalized　travel　cost.　The　study　reveals　that　uncertainty　expectation　can　significantly　influence　the　travel　decisions　and　lead　to　a　distinctive　flow　pattern.　We　also　examine　the　effects　of　transit　headway　and　fare　on　modal　split　and　equilibrium　cost　by　numerical　examples.　©　2015　Elsevier　B.V.　All　rights　reserved.