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. 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
2015-01-31
24
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 mayhelp.but they have not been widely deployed.Now scientists have an idea that couldmake 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/ngq7777K
0
大学英语四级
相关试题推荐
A、Theyhavenoweekend.B、Themeetingsusuallygoontoolong.C、Theycan’tgettheup-to-dateinformationinwork.D、Thecollea
Oncetheharddecisionshavebeenmadeabouthowtotreatapatient’scancer,doctorsfaceanevenmoredifficultquestion:how
Theinnervoiceofpeoplewhoappearunconsciouscannowbeheard.Forthefirsttime,researchershavestruckupaconversation
Americanshavelongpridedthemselvesasbeingpartofanoptimisticsociety.ButanewresearchdescribesAmericansaspessimis
TodayAmericanparentsarefindingthemselvesinadilemmaabouthowtodealwithteenagedrinking,aserioussocialproblem.A
A、Changingthewayofsprayingcrops.B、Buyingsomeoutdoorinsectlamps.C、Usingacombinationofthreeinsecticide.D、Tryingt
A、Themanshouldlosesomeweight.B、Themanisinpoorhealth.C、Theoilyfoodisharmfultotheman’shealth.D、Thewomanwoul
Politicsisanemotionalbusiness.Still,manypeoplefoundthemselvesunusuallymovedbythehistoricpresidentialinauguration
Thegreatship,Titanic,sailedforNewYorkfromSouthamptononApril10th,1912.Shewascarrying1,316【C1】______andcrewof8
Thegreatship,Titanic,sailedforNewYorkfromSouthamptononApril10th,1912.Shewascarrying1,316【C1】______andcrewof8
随机试题
小儿5岁,因发热4天,伴咽痛、头痛、呕吐并出现左下肢不能站立行走来诊。体检,体温38℃,神志清,心肺无异常,左下肢肌力Ⅰ级,膝跟腱反射未引出,病理反射阴性,双下肢痛觉存在。该病人处理中,哪项是错误的
三相异步电动机的定子由主磁极、换向极及激磁线圈所组成。()
某处方中阿托品项下,医生对该药的用法用量是这样缩写的:0.1mgi.m.stat.!,则该药的用法用量是
便秘可选用的处方药有()
甲缴纳税款20万元后,又假报出口,骗取出口退税48万元,则下列说法正确的是()
对于一种“纯公共物品”,在其总供给量保持不变的情况下,如果增加一个人对它的消费量,则其他人可消费数量的变化情况是()。
2013年,每百家企业拥有网站个数从低到高排序正确的是()。
在光纤通信中常用到三个“波窗”,常用的这三个波段中心分别位于0.85微米,(8)微米和1.55微米。其中,(9)微米波段处衰减较高。
【B1】【B10】
在所有中国艺术品中,最为知名的当数瓷器。瓷器不仅受到了中国人的喜爱与垂青,而且还受到了海外人士的青睐与认可。中国之所以能够成为首先“发明”瓷器的国家,主要原因有两个:一是中国制陶工人发现了粘土,二是他们掌握了生成高温并熔化粘土的方法。唐朝(公元6
最新回复
(
0
)