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
2014-12-31
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 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://jikaoti.com/ti/tf4FFFFM
0
大学英语四级
相关试题推荐
A、Therewasaserioustrafficaccident.B、Adriverwaskilledinherspecially-builtcar.C、Awomanfellontoacarfromahigh
A、Towarntravelerstotakecareoftheirbelongings.B、Totelltravelershowtofindtheirlostluggage.C、Toprovideinformati
A、Tochatonlinewithhisbrother.B、Tosearchforinformationforhisresearch.C、Tojointhenewsgroupfordiscussion.D、Togi
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
A、Becausetheydon’thaveanyexperience.B、Becausetheycan’tcopewithemergencies.C、Becausetheirbrainsarenotfullydevel
A、Eatmore.B、Takeexercises.C、Avoidstressfulstuff.D、Quitdrinking.B细节辨认题。短文中明确提到,当人们更健康地饮食、运动、戒掉烟、更好的处理压力及更爱别人时,就会感觉很好。四个选
Unlikeothercountrieswhereitiscommontoseetwowomenortwomenholdinghands,suchbehaviorisfrowneduponinWesternco
Unlikeothercountrieswhereitiscommontoseetwowomenortwomenholdinghands,suchbehaviorisfrowneduponinWesternco
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceeducationhaveonethingincommon:Theyofferthesam
TheymaynothavethenamerecognitionofaGoogleoraYahoo,buttheycanclaimtobelonginthesameleague.Thewebsitesof
随机试题
简述实用主义教育学的基本主张。
采用数据电文形式订立合同的,合同成立的地点是()
盐酸氯丙嗪主要用于
开庭日期确定后,书记应当在开庭三日前将传票送达当事人,将开庭通知书送达()等有关人员。
公安机关具有武装性质,主要表现为()
有句谚语:早起的鸟儿有虫吃,早起的虫儿被鸟吃。一样的早起,命运截然不同。植物被冻死,不是在严冬,而是在早春,因为急着生长却纷纷倒在了看似机遇的春寒之中。种子在库内不能发芽,种到田里又不能不发芽,否则就不是好种子。从这些例子中,我们不难得出“机”的重要性。所
λ为何值时,线性方程组有解?并求其全部解.
Inthedaysbeforepreschoolacademieswereallbutmandatoryforkidsunder5,IstayedhomeandgotmyearlyeducationfromMi
以下关于定性风险分析的描述中,不正确的是______。
如果把命令按钮的Cancel属性设置为True,则程序运行后
最新回复
(
0
)