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
51
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
PoorpeoplehaveI.Q.’ssignificantlylowerthanthoseofrichpeople,andtheawkwardconventionalwisdomhasbeenthatthisis
PoorpeoplehaveI.Q.’ssignificantlylowerthanthoseofrichpeople,andtheawkwardconventionalwisdomhasbeenthatthisis
PoorpeoplehaveI.Q.’ssignificantlylowerthanthoseofrichpeople,andtheawkwardconventionalwisdomhasbeenthatthisis
A、Poetryispopularamongthegeneralpublic.B、Peopletherehavenointerestinpoetry.C、Poetryisthemostpopularliterature
A、Arrangingcoursesforthem.B、OfferingthemaccesstotheInternet.C、Supportingtheirinterest.D、Givingthemconstructivead
A、Thewomanhadbeenfinedmanytimesbefore.B、Thewomanknowshowtodealwiththepolice.C、Thewomanhadviolatedtrafficre
WhySummerVacationWontMakeYouHappierA)Fromaninformalandhighlyunscientificsurveyoffriendsandcolleagues,Icanre
Politicsisanemotionalbusiness.Still,manypeoplefoundthemselvesunusuallymovedbythehistoricpresidentialinauguration
Yearsago,doctorsoftensaidthatpainwasanormalpartoflife.Inparticular,whenolderpatients【C1】______ofpain,theywer
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamassbasisortofindthegiftedfewan
随机试题
ShareholdersandCompaniesInthelasthalfofthenineteenthcentury"capital"and"labour"wereenlargingand【W1】______thei
膀胱湿热型尿路感染患者的中医治疗应选用
个体户张某开了一家杂货店,某地工商行政管理部门在进行检查时,发现张某所卖的货物中有不少过期食品和伪劣产品,因而作出没收过期食品和伪劣产品、没收张某的营业执照,并对张某处以500元罚款的行政决定。张某不服,向其上一级工商行政管理部门申请行政复议,复议机关作出
某建筑工程勘察1号孔深度为:10m,地层为:0~2m为含硬杂质≤10%的填土;2~8m为细砂;8~10m为卵石(粒径≤50mm的颗粒大于50%)。0~10m跟管钻进,孔口高程50m,钻探时气温30℃,按2002年收费标准计算钻孔的实物工作收费额,其结果为(
下列材料单价的构成费用,包含在采购及保管费中进行计算的有()。【2013年真题】
支线综合管廊用于容纳()工程管线。
癌症医疗保险金,被保险人经医院确诊于附加合同生效日起一年内初次患“癌症,按保险金额的()给付癌症医疗保险金
编造、故意传播虚假恐怖信息,严重扰乱社会秩序,具有下列哪一情形的,应当处5年以上有期徒刑?()
根据域名代码规定,GOV代表
IfI______freetomorrow,Iwillgoshoppingwithmyaunt.
最新回复
(
0
)