首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. At unmanaged junctions, a pattern
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. At unmanaged junctions, a pattern
admin
2014-09-30
25
问题
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. At unmanaged junctions, a pattern of stop-go movement can still be frustrating and burns more fuel than a smooth passage would. Creating such a smooth passage means adjusting a vehicle’s speed so that it always arrives at the lights when they are green. That is theoretically possible, but practically hard. Roadside signs wired to traffic lights may help, but they have not been widely deployed. Now scientists have an idea that could make the process cheaper and more effective. Instead of a hardwired network of signs, they propose to use mobile-phone apps.
For a driver to benefit, he must load the special software, dubbed SignalGuru, into his phone and then mount it on a special bracket attached to the inside of his car’s windscreen, with the camera lens pointing forwards. SignalGuru is designed to detect traffic lights and track their status as red, amber or green. It broadcasts this information to other phones in the area that are fitted with the same software, and—if there are enough of them—the phones thus each know the status of most of the lights around town. Using this information, SignalGuru is able to calculate the traffic-light schedule for the region and suggest the speed at which a driver should travel in order to avoid running into red lights.
Tests in Cambridge, Massachusetts, where five drivers were asked to follow the same route for three hours, and in Singapore, where eight drivers were asked to follow one of two routes for 30 minutes, revealed that SignalGuru was capable of predicting traffic-light activity with an accuracy of 98. 2% and 96. 3% respectively, in the two cities. This was particularly impressive because in Cambridge the lights shifted, roughly half-way through the test, from their off-peak schedule to their afternoon-traffic schedule, while in Singapore lights are adaptive, using detectors embedded(嵌入)under the road to determine how much traffic is around and thus when a signal should change. Fuel consumption fell, too—by about 20%. SignalGuru thus reduces both frustration and fuel use, and makes commuting a slightly less horrible experience.
Roadside signs have not been widely deployed probably because______.
选项
A、they are less effective in bad weather
B、it takes more money to install them
C、it is hard to wire them to traffic lights
D、they take up too much space
答案
B
解析
推理判断题。定位句明确指出,路旁信号装置没有得到广泛使用,但是没有直接阐述原因,而是在下一句中通过描述科学家的一个办法暗示出来:现在,科学家们想出一个更便宜、更有效的办法。由此推断,路旁信号装置之所以没有得到广泛应用可能是由于费用过高、效果不理想,故B)“安装它们需要花费更多的钱”符合文意。
转载请注明原文地址:https://kaotiyun.com/show/bVv7777K
0
大学英语四级
相关试题推荐
AUNreportsaysthatoverhalftheworld’speoplenowliveincities.A(1)______ago,lessthanfivepercentofallpeoplelived
A、TVprogramsshouldbeimproved.B、WatchingTVisharmfultokids.C、Kidsshouldeatmorepotatoes.D、Kidsshouldtakemoreexe
A、Hehaslosthisdrivinglicense.B、Hehasviolatedthetrafficrules.C、Hehasjustcomebackfromthehospital.D、Heplansto
A、Timedifference.B、Weathercondition.C、Programschedule.D、Viewintroduction.B
Tensofthousandsofthepoorestpart-timestudentsaretogetextramoneytohelppayuniversityfeesandmeetrisinglivingco
保健食品中国的保健食品市场首次出现于20世纪80年代。保健食品是指宣称具有特定保健功能,或是可以补充维生素或矿物质的食品。保健食品适用于特定人群消费,具有调节人体功能的效果,但不用于治疗疾病。保健食品有两种。一种是具有特定保健功能的食品,另外一种
A、ReadingsomethingabouttheGreatWall.B、Takingavacation.C、VisitingtheSummerPalace.D、TeachingEnglish.D细节辨认题。女士问男士的暑假
Blindphotographysoundsstrange.Butastriking【B1】______ofphotographsinCalifornia,arguesthatitstemsfromthecoreofco
A、Hesufferedfromheartfailureanddied.B、Hewonthreeawardsafterhisdeath.C、Hisplayswerewrittenbasedonhisownlife
A、Hedidn’tknowwhathospitalTomwasin.B、HetookTomtothehospital.C、Hefeltsorrythatthewomanhurtherself.D、Heforg
随机试题
患者,男性,30岁,无意中发现左侧阴囊有一硬结,无疼痛。查体:左侧附睾尾部可触及结节样肿物,同侧输精管增粗。为进一步完善诊断,需做哪项检查
患者,男,64岁,高血压升高两年余,经至少三种降压药物治疗,效果欠佳,近期体检提示血肌酐值偏高。肾动态显像结果显示患者左肾较右肾偏小,显像剂分布较稀疏,双肾肾图形态一致,但左肾肾图幅度较右肾图幅度低30%,考虑可能的诊断是
患者,男,65岁。因“腰腿痛伴间歇性跛行2年,加重2个月”入院。患者2年前开始出现下腰痛,逐渐出现双下肢疼痛麻木和发胀感,右下肢明显,行走约1000m后需停下休息。保守治疗无效。近2个月感腰腿痛及麻木感加重,行走约150m即需蹲下休息,并出现双下肢无力感。
营养失调不属于肝硬化的直接或间接病因。
下列选项中,不是慢性唇炎的临床表现的是
对于不同的基金品种,份额登记时间可能不一样,一般基金是()日登记。
预算最主要的特征是()。
B公司是一家制造企业,2009年度财务报表有关数据如下:B公司没有优先股,目前发行在外的普通股为1000万股。假设B公司的资产全部为经营资产。流动负债全部是经营负债。长期负债全部是金融负债。公司目前已达到稳定增长状态,未来年度将维持2009年的经营效率
Whatshouldbedoneifonewantstogainorloseweight?Theprocessofgainingorlosingweightcanbeexplainedbycompari
Ethnographyisthestudyofaparticularhumansocietyortheprocessofmakingsuchastudy.Contemporaryethnographyisbased
最新回复
(
0
)