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1、城市干道交通协调控制方案设计—张晟杰UrbanroadsTrafficCoordinationControlDesignAsisknowntoall,intersectionistheweaklinkoftrafficnetworkinurbanroadandtrafficjamiseasilyformedatthepeakperiodoftraffic.Inordertoprovidesomeimportanttrafficvolumeparametersforplanningandconstructionofurbanroadnet,thebasicc
2、haracteristicsofintersectiontrafficvolumeareanalysedandshot-timetrafficvolumearepredicted.Allthiswillmakesignificantdirectionsforraisingtheservicelevelofurbanroad,improvingthefunctionofurbanroadnetandincreasingthetrafficcapacityandsecurity.Trafficvolume,whichmeansthevehiclenumbero
3、fcrossingacertainsectionatunittime,isanimportantparameterfordescribingthetrafficflowcharacteristics.Themainlymeasuringmethodsoftrafficvolumearemanualcountmethod,mechanicalcountmethod,videomethodandaerialphotographicmethod.Manualcountmethodisamethedwhichcanbeusedatanytimeandanywher
4、etoinvestigatethetrafficvolume.Ithasmanyadvantages,suchasdistinguishingthevehicletypeandtrafficdirection,notcomplicated,easyoperation,highdefinition,easydatatreatmentandlowcost.Soitisacommonmethodfortrafficinvestigationandisusedinthispaper.Atagradeintersection,aconflictareaisaspac
5、ewhichtrafficunitsindifferentflowdirectionshavetopass.Acriticalpointisthemostdangerouspointintheconflictarea.Thetrafficunitsenterintotheconflictareainturnaccordingtosignalsequence.themovementofatraffictailunitreleasedwhenendingagreenlightifromitsstoplinetopassthroughthecriticalpoi
6、ntisreferredtoasaclearing,andthelengthofthetraceofthismovementisreferredtoasaclearingdistancesi,thetimespendbythemovementisaclearingtimeti.Themovementofatrafficheadunitreleasedwhenstartingagreenlightjfromitsstoplinetothecriticalpointisreferredtoasanentry,andthelengthofthetraceofth
7、ismovementisreferredtoasanentrydistancesj,thetimespendbythemovementisanentrytimetj.Theroadchannelizationoftheintersectioncanmakethetrafficunitsindifferentflowdirectionspassalongacertainpathrespectively,sothateachoftheconflictareasandthecriticalpointpositionsisrelativelyfixed.Motor
8、vehicleswhichgostraightandturnlef
