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
职业资格
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. Drivers exchange the gridlock that
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. Drivers exchange the gridlock that
admin
2018-03-02
30
问题
Traffic lights are crucial tools for regulating traffic flow. They are not, however, perfect. Drivers exchange the gridlock that would happen at unmanaged junctions for a pattern of stop-go movement that can still be frustrating, and which 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 a 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 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、it takes a lot of space to put them up
B、it is hard to wire them to traffic lights
C、they cost more money to install
D、they are less effective in bad weather
答案
C
解析
推断题。短文第一段最后提出“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.”,即路旁信号装置可能会有帮助,但是并没有得到广泛使用。现在科学家想到了一个更便宜、更有效的方法。由此可推断路旁信号装置没有得到广泛使用的原因可能是它费用太高。故选C。
转载请注明原文地址:https://kaotiyun.com/show/YX3v777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
材料:某教师关于“伐无道,诛暴秦”内容的教学片段如下:上课开始不久,教师展示关于刘邦的一段话:“军事谋划,我不如张良;治理国家,我不如萧何;统军作战,我不如韩信”。随后教师总结道:“楚汉战争中刘邦取得胜利的最主要原因是善于用人,而项羽则不善用人。”这
材料:以下是某教师在准备讲授“辛亥革命”的相关内容时,对辛亥革命的思想基础内容的教学设计:思想基础:民主革命思想广泛传播(板书)。师:在辛亥革命爆发前,资产阶级革命党人做了大量的思想宣传和动员工作,使民主革命的思想得到广泛传播。他们向西方学习,将“三
Whencheckingstudents’understandingofacertainlanguagepointinclass,whichoffollowingutterancesisateacherexpected
AccordingtoBartlett,reflectiveteachingincludesfivestages,thatis,mapping,informingandthreeotherstagesEXCEPT______
Abigfocusofthecriticismofcomputergameshasconcernedthecontentofthegamesbeingplayed.Whenthenarrativesoftheg
Wefindthatbrightchildrenarerarelyheldbackbymixed-abilityteaching.Onthecontrary,boththeirknowledgeandexperienc
Theclassroomteachingenvironmentconsistsofclassroomenvironmentand______.
YANGON—MyanmarhasofficiallyacceptedanofferoftheUnitedStatestosendhumanitarianaid(人道主义援助)tothecountry’scyclone(飓风
YANGON—MyanmarhasofficiallyacceptedanofferoftheUnitedStatestosendhumanitarianaid(人道主义援助)tothecountry’scyclone(飓风
EverytimeIspeakinfrontofalargecrowd,Icanfeelthe______inmystomach.
随机试题
A.滋阴补肾B.健脾益气C.活血化瘀D.健脾补肾,佐以渗湿E.泻火解毒,清利肝胆小儿尿路感染急性期,肝胆郁热证的治法是
水质标准是指对特定目的或用途的水中所含杂质或污染物种类与浓度的()。
国有工程监理企业改制为有限责任公司的基本步骤中,产权界定的前一项工作是()
根据《煤矿防治水规定》的规定,防治水工作应当坚持()的原则。
来自( )的应检货物入境时,报检人须按规定提交与包装有关的证书和声明。
刑罚的主刑包括()。
从股东因素考虑,股东限制股利的支付,可达到的目的是()。
下列关于结社自由,说法正确的有()。
Mammalsvaryenormouslyinsize,fromweighinglessthanapennytomeasuringmorethanthreeschoolbusesinlength.Somegroup
Throughouthistory,humanshavesufferedfromaconditionthattheyhaveneverbeenabletoescape—ageing.Someresearchers,how
最新回复
(
0
)