In　the　real　road　traffic　system,　local　congestion　always　occurs　near　the　intersections　or　bus　stops,　which　have　become　the　main　bottlenecks　of　urban　traffic　development.　Considering　the　scenario　with　signalized　intersection　and　a　near-by　bus　stop,　this　paper　investigates　the　lane-changing　and　dwelling　behaviors　in　a　two-lane　mixed　traffic　and　conducted　the　simulation　using　a　cellular　automaton　model　under　open　boundary　condition.　Simulation　results　show　that　for　different　proportions　of　bus　flow　over　the　whole　flow,　a　critical　probability　sending　vehicles　into　the　system　exists　and　represents　the　decreasing　trend　with　respect　to　the　bus　flow　proportion.　Within　the　critical　value,　traffic　is　always　the　free　flow　and　the　flow　increases　with　the　probability;　whereas,　beyond　the　critical　value,　the　traffic　will　be　saturated.　The　paper　proposes　that　during　rush　hours,　the　queuing　upstream　the　intersection　can　stretch　to　the　bus　stop　and　then　disturb　the　normal　dwelling　operation　of　buses.　Therefore,　it　is　necessary　to　reasonably　design　the　position　of　signalized　intersection　and　the　corresponding　cycle　time.　Copyright　©　2012,　China　Association　for　Science　and　Technology.　Electronic　version　published　by　Elsevier　Limited.　All　rights　reserved.