分离式立交课程

分离式立交课程第1页/共24页At-gradeintersectionRoundabout第2页/共24页Interchangewithoutramps(分离式立交)Interchangewithramps(互通式立交)

第3页/共24页IntroductiontointersectioncontrolBasicruleofroad（基本通行规则）---1.Driverontheleftyieldtothoseontheright2.Throughtraffichasright-of-wayoverturningmovements3.Sightdistanceshouldbemet.(sighttriangle视距三角形)

第4页/共24页STOPandYIELDsigns---1.Two-waySTOPsign(TWSC二路停车)mostpopular-usedcontrolmethodatunsignalizedintersectionswheremajorandminorroadwaysaremet,theSTOPsignsareinstalledatapproachesonminorstreetvehiclesonmajorstreetpassintersectionwithoutstopping,whilevehiclesonminorstreethavetostopfirstandthenusegaptopassintersection第5页/共24页Rankingofpassingtwo-waystopcontrolintersection第6页/共24页

2.YIELDsign

usedatunsignalizedintersectionswheremajorandminorroadwaysaremet,theYIELDsignsareinstalledatapproachesonminorstreetsvehiclesonmajorstreetpassintersectionwithoutstopping,whilevehiclesonminorstreethavetoslowdownfirstandthenusegaptopassintersectionThedifferencebetweenSTOPandYIELDisthatdriversdonotnecessarilystopatintersectionapproachwhereYIELDisapplied.第7页/共24页YIELDsigninUKYIELDsigninChinaYIELDsigninUSA第8页/共24页3.Multi-way(Full-wayorAll-way)STOPsign（多路停车或全路停车）theSTOPsignsareinstalledatapproachesonallapproachesfirstcomefirstpassisobservedall-waystopcontrolisusedwheresamelevelroadwaysintersect第9页/共24页第10页/共24页TheSTOPsignusedinBeijing,China第11页/共24页4.CapacityofTWSCa.PriorityofmovementsforTWSCb.Conflictingvolume（冲突流量）c.Criticalgapandfollow-uptime（临界可接受间隙与随车时距）d.Potentialcapacity（可能通行能力）

第12页/共24页Raff’sModel第13页/共24页第14页/共24页Trafficsignal1.Merit(1)provideorderlymovement

(2)enhancetraffic-handlingcapacity(3)reducefrequencyandseverityofcrashes(4)coordinatecontinuousmovementalongarterial(5)protectpedestriansandbikers第15页/共24页2.Demerit(1)excessivedelay(2)excessivedisobedienceofthesignalindications(3)encouragecut-throughtraffic(4)increaseofrear-endcollisions第16页/共24页3.WarrantsbasedonMUTCD(设置依据）1.Volumeprinciple(eight,four,andpeakhours)2.Pedestrian/bikerprinciple3.Schoolcrossingprinciple4.Coordinationprinciple

（协调原则）

5.CrashprincipleNote:

Engineeringjudgmentplayskeyrole.