More　and　more　attention　has　been　given　to　understanding　the　uncertainty　regarding　the　travel　time.　In　this　paper,　travel　time　is　studied　by　collecting　video　monitoring　data　on　Beijing　Jingtong　Expressway.　The　data　shows　that　vehicle　travel　time　is　influenced　by　departure　time,　bus　lane,　vehicle　restriction,　and　the　number　of　exits　and　entrances　and　anomaly　events.　This　paper　determines　three　travel　time　reliability　evaluation　models　to　study　15　min　interval　travel　time　reliability　based　on　Florida　Department　of　Transportation＇s　research　results,　Beijing　urban　road　traffic　operation　evaluation　system　and　the　results　of　questionnaire　survey　of　traveler.　The　results　suggest　there　are　significant　differences　among　the　reliabilities　under　different　models.　Last,　on　the　basis　of　dynamic　optimization　method,　traffic　management　department　can　optimize　traffic　operation　management　scheme　and　improve　traffic　operation　quality.　Results　of　this　paper　can　provide　reference　to　road　planning,　operation　management,　and　information　publication.　©　ASCE.