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
2013-11-18
74
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 burn 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(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、they cost more money to install
C、it is hard to wire them to traffic lights
D、it takes a lot of space to put them up
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/OPS7777K
0
大学英语四级
相关试题推荐
A、Theywerenottreatedequallyuntil1881.B、Theywerenotawardeddegreesuntil1948.C、Theyhavenoexamsuntil1948.D、Very
A、TeacherandstudentB、EmployerandemployeeC、FriendsD、ClassmatesB
A、ToshowrespecttothismodernAmericanhero.B、ToindicatehowimportantDr.MartinLutherKingis.C、Toillustratewhatamo
A、Tofindaworkerandfollowhimclosely.B、Tofindapersonyouadmireandmakefriendswithhim.C、Tofindapersonyourespe
Nuclearpowerplantsprovideabout17percentoftheworld’selectricity.Somecountriesdependmoreonnuclearpowerforelectr
A、Shefeltitwastiring.B、Shefeltitwasverynice.C、Shethoughtittooklesstime.D、Shethoughtitwasexpensive.BM:Did
Assoonasitwasrevealedthatareporterforprogressivemagazinehaddiscoveredhowtomakeahydrogenbomb,agroupoffirea
A、Tomakeajourney.B、Toattendameeting.C、Topurchasesomething.D、Tomeethiswife.BWhydoesthescientisttakealongtra
Three-year-oldJackhasbeenuphalfthenight,screamingwithpain.Now,heisinthedoctor’ssurgery,wherehisGPreportsth
Nowadayspeoplehaveincreasinglybecomeawareoftheneedtochangetheireatinghabits,becausemuchofthefoodtheyeat,par
随机试题
在手关节横断层面上,近侧列腕骨自桡侧向尺侧为_______________、_______________、_______________和_______________,远侧列腕骨自桡侧向尺侧为_______________、______________
病毒的形态学检查方法不包括
A、药物经济学B、成本C、直接成本D、间接成本E、隐性成本因疾病引起的疼痛,精神上的痛苦、紧张和不安,生活与行动的某些不便()
《安全生产法》规定了生产经营单位主要负责人对本单位安全生产工作所负的职责,其中最重要的一条是()。
【背景资料】某机电安装工程公司总承包一大型制药厂设备安装工程。合同约定,工程设备和主材由业主采购提供。管道工程安装时,因业主提供的水泵迟迟不能到货而影响工期,项目部为保证施工进度自行采购部分水泵并进行安装,安装后被监理工程师发现,下令停工。经与业
W公司是一家多元化经营的公司,公司领导层正在思考是否应该采取措施将新的业务加入到业务组合中去,在有吸引力的行业中建立新的地位。该公司领导的想法体现的是公司战略层次的()。
教育这个社会子系统的三个基本要素是:教育者、学习者和()
人力弹性理论:是指在人力资源管理中,通过灵活调整人力结构、员工数量、工作数量、工作内容、工作时间、员工薪资等因素,来满足企业对不同层次、不同水平和不同模式的人力资源需求的管理方式。其最大特点在于主要不是依靠外力(如上级发号施令),而是依靠个性平等、民主管理
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。
TheVictorianAgewaslargelyanageof______,eminentlyrepresentedbyDickensandThackeray.
最新回复
(
0
)