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
69
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.
What do drivers do if they want to pass unmanaged junctions smoothly?
选项
A、They must wait patiently until traffic lights turn green.
B、They need to help traffic police to regulate traffic flows.
C、They can drive through the red lights if nobody is around.
D、They have to adjust the speed in time for the green lights.
答案
D
解析
细节题。短文第一段中间部分指出Creating such a smooth passage meansadjusting a vehicle’s speed so that it always arrives at the lights when they are green.即若想畅通行驶,就意味着要调节车速,让车辆在到达交通灯时总遇到绿灯。故选D。
转载请注明原文地址:https://kaotiyun.com/show/8Rq7777K
0
大学英语四级
相关试题推荐
AccordingtorecentUnitedStatesDepartmentofAgriculture(USDA)projections,thecountrywillseeasharpdropinmeatconsumpt
Gettingagoodnight’ssleephaslongbeenknowntoconsolidatetheday’smemories,movingthemfromshort-termstorageintolon
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
Hedecidedto______(把余生献给)scientificresearch.
Unlikeothercountrieswhereitiscommontoseetwowomenortwomenholdinghands,suchbehaviorisfrowneduponinWesternco
Theinnervoiceofpeoplewhoappearunconsciouscannowbeheard.Forthefirsttime,researchershavestruckupaconversation
EarlierthisyearImetwithagroupofwomeninMatela,asmallfarmingvillageinTanzania,andwediscussedsomethingthat’s
TodayAmericanparentsarefindingthemselvesinadilemmaabouthowtodealwithteenagedrinking,aserioussocialproblem.A
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceeducationhaveonethingincommon:Theyofferthesam
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceeducationhaveonethingincommon:Theyofferthesam
随机试题
毛泽东曾评价叶剑英“诸葛一生唯谨慎,吕端大事不糊涂”,这是对叶剑英()的评价。
患者女,38岁。闭经45天、腹痛2小时,临床诊断宫外孕,曾孕三产一胎,人工流产二胎。有输血史。医生决定立即急诊手术治疗,术中输A型血2U,手术后三天患者仍贫血,又输注A型红细胞2U。一周后患者低热、出现轻度黄疸,血红蛋白不升,反而下降,无血红蛋白尿。应
关于索赔费用的描述,下列说法中正确的是()。
下列基金当事人中,()可以对基金投资者会议审议事项行使表决权。
下列关于凸性的说法中,正确的有()。
一般资料:张某,女性,19岁,大学一年级学生。案例介绍:张某以高分考入某重点大学,她学习认真,乐观开朗,热情助人,人际关系良好,很受同学的喜欢。但这学期开学后同学们纷纷反映张某变了,有时很兴奋,不停地自言自语说着什么,但同学们听不懂她在说什么,说话
“暴动,打倒国民政府!”“暴动,杀土豪劣绅!”“暴动,组织革命委员会!”,“暴动,农民夺取土地!”暴动的口号山鸣谷应,起义的烽火势欲燎原,迅速席卷了湘东赣西的广阔原野。相比较南昌起义,1927年湘赣边界秋收起义的特点有
下列关于SQLServer2008分离和附加数据库的说法,错误的是()
以下关于通用对话框的叙述中,错误的是
Ausancebillisabillpayableimmediately.
最新回复
(
0
)