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1、urbantrafficstructureintheurbanpublictransportsystem,railtrafficwithafast,largecapacity,lowpollutionandhighefficiency,becomeanindispensablepartofurbantrafficstructure,isthecontradictionbetweensupplyanddemandofthegrowingmetropolis,cities,effectivemeanstomeettheneedsofurbantraffic.Th
2、efollowingtableisarailtransportandothermodesofurbanpassengertransportcapacity,transportationspeedandresourceconsumption,andsoon.Comparisonofurbanpassengertrafficcharacteristicstable5.1-2trafficvolume(human/h)transportspeed(km/people)Roadareaoccupied(M2/people)scopebike2,00010-153,0
3、00shortcar20-5010-20widebus6,000-9,0001-240-600.25-0.5fromtheMetrolightrailof10,000-30,000inlong-distanceline3Morethan0,00040-60donotoccupyanareabothintermsoftransportoverlongdistances,transportefficiency,orfromthelevelofresourceconsumptionandenvironmentalpollution,railtransportisu
4、ndoubtedlyaneffectivemeanstosolvetheproblemoftrafficcongestionincities.Especiallyinurbanpopulationstrengthenormoustrafficdemandontheroutetoeasetrafficpressure,railtransportationhasincomparableadvantages.Washington,DC,areaof177km2,andapopulationof600,000,isaUnitedStatespoliticalcent
5、er.FortheWashingtonMetrosystemUnitedStatessecond-busiestsubway,secondonlytotheNewYorksubway,openedin1976.Currentrailsizesfor5,station86,total171.6km,netannualpassengervolumereached223millionpeople.Accordingtostatistics,from2000to2009vehicletripdown12.7%,bustravelhasincreasedby12%.O
6、bjectivesoftheWashingtonMetrosystemboilsdowntothefollowingthreepoints:bydrivingontothetracksatthestationtransfermodeinordertoalleviatetrafficcongestion;Forthosewhowillnotorcannotdrivethepersonwithabetteroptionthanconventionalpublictransit;Blockhighwayurbantrafficstructureintheurban
7、publictransportsystem,railtrafficwithafast,largecapacity,lowpollutionandhighefficiency,becomeanindispensablepartofurbantrafficstructure,isthecontradictionbetweensupplyanddemandofthegrowingmetropolis,cities,effectivemeanstomeettheneedsofurbantraffic.Thefollowingtableisarailtransport
8、andothermodesofurbanpassen
