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2、_____收集于网络,如有侵权请联系管理员删除__________________________________________________2019高考英语二轮阅读理解专练(详解)—科普知识Trafficlightsarekeytoolsforregulatingtrafficnow.Theyarenot,however,perfect.Driversexchangethetrafficjamsthatwouldhappenatunmanagedcrossingsforapatternofstopgomovementt
3、hatcanstillbeannoying,andwhichburnsmorefuelthanasmoothpassagewould.Creatingsuchasmoothpassagemeansadjustingavehicle'sspeedsothatitalwaysarrivesatthelightswhentheyaregreen.Thatistheoreticallypossible,butpracticallyhard.Roadsidesignswiredtotrafficlightscanhelpgettheme
4、ssageacrossacouplehundredmetresfromacrossing,butsuchsignsareexpensive,andarenotwidespread.MargaretMartonosiandEmmanouilKoukoumidisatPrincetonUniversity,andLiShiuanPehattheMassachusettsInstituteofTechnology,however,haveanideathatcouldmaketheprocesscheaperandmoreeffe
5、ctive.Insteadofahardwirednetworkofsigns,theyproposetousemobilephoneapplications.Foradrivertobenefit,hemustloadtheteam'ssoftware,namedSignalGuru,intohisphoneandthenputitonaspecialthingattachedtotheinsideofhiscar'swindscreen,withthecameralens(镜头)pointingforward.Signa
6、lGuruisdesignedtodetecttrafficlightsandtracktheirstatusasred,yelloworgreen.Itbroadcaststhisinformationtootherphonesintheareathatarefittedwiththesamesoftware,and—ifthereareenoughofthem,thephonesthuseachknowthestatusofmostofthelightsaroundtown.Usingthisinformation,Sig
7、nalGuruisabletocalculatethetrafficlightschedulefortheareaandsuggestthespeedatwhichadrivershouldtravelinordertoavoidredlights.TestsinCambridge,Massachusetts,wherefivedriverswereaskedtofollowthesamerouteforthreehours,andinSingapore,whereeightdriverswereaskedtofollowo
8、neoftworoutesfor30minutes,revealedthatSignalGuruwascapableofpredictingtrafficlightactivitywithanaccuracyof98.2%and96.3%respectively,inthe