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ID:14117449
大小:132.00 KB
页数:7页
时间:2018-07-26
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1、THEEFFECTOFTRAFFICLIGHTCONTROLONASINGLEINTERSECTION(collegeofPhysicsandelectronicsengineeringofGuangxiNormaluniversity,Guilin541004,Guangxi,China)Acellularautomatamodelforasingleintersectionwithopenboundaryconditionsispresented.Inthismodel,thevehiclesareallowedtoturntheirdirectionswithap
2、robability.Weanalyzethetrafficflowcharacteristicsofthemodelandtheoptimizationofgreenratio.Thesimulationsunderdifferenttrafficconditionsaregiven.Itcanbefoundthattheoptimizationofgreenratiodependsontheboundaryconditionsbutindependentsontheperiodoftrafficlight.Thereisaoptimumrangeofgreenrat
3、ioforfixedboundarycondition.Theinfluenceofturningprobabilityontrafficflowisalsodiscussed.Turningpermissionleadstothedisappearofcongestiononstreet.Keywords:cellularautomatamodel;optimumgreenratio,openboundary;singleintersection1.IntroductionInrecentyears,trafficjamshavebecomethemostdiffic
4、ultproblemincity.Andwecanfindthattrafficjamsalwaysappearneartheintersections.Atthecontrolledintersections,trafficlightshaveimportantinfluenceuponthetrafficflow.Ifthetrafficsignalsettingisunsuitable,itwillnotonlyhasdestructiveeffectsontraffic.butalsoendangerthepedestrians.So,howtooptimumt
5、hetrafficsettingisthemainconcernforthetrafficengineersandresearchers.Anumberoftrafficsignalcontrolmodelshavebeendevelopedinthepast.Thesemodelsareusuallyformulatedusingthelanguafeofcellularautomata(CA).ThefirstmodelofcitytrafficwasintroducedbyBiham,MiddletonandLevine(BML).Thismodelcanpred
6、ictasortofphasetransitionfromfree-flowtoajammedstate,butthemodelassumptionsaretoosimpletobetakenseriouslyforpracticalpurpose.LateramoreseriousmodelofcitynetworkwasintroducedbyChowdhuryandSchadschneider(ChSch).ThismodelcombinestheBMLmodelandNagel-Schreckenberg(NaSch)modelofhighwaytraffic.
7、Itcandemonstrateaphasetransitionfromthe“free-flowing”phasetothecompletely“jamming”phaseatavehicledensity.Anditalsogivesthetimedependenceoftheaveragespeedsofthecars.Inaveryrecentyears,theChSchmodelwasextendedbyE.Brockfeldtoaccountfordifferenttypesofglobalsignalization.Base
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