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
2013-09-24
70
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.
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 flow.
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
事实细节题。根据定位句可知,在管理不善的交叉路口,驾驶过程让人懊恼,还会耗油,要想实现顺畅的行驶,就意味着要调节车速,让车辆在到达交通灯时总遇到绿灯便可。故正确答案为D)“他们必须调节速度以及时赶上绿灯”。
转载请注明原文地址:https://kaotiyun.com/show/sGc7777K
0
大学英语四级
相关试题推荐
A、Preparingchildrenacademically.B、Developingchildren’sartisticinterest.C、Tappingchildren’spotential.D、Shapingchildren
A、Hemakesafoolofhimselfbyeatingtoomuch.B、Helikestoeatsomethingotherthanbeef.C、Hewantstoeatsomemoreroast
Itwilltakeustwentyminutestogettotherailwaystation,______trafficdelays.
A、AttheendofNovember.B、InthemiddleofNovember.C、AtthebeginningofDecember.D、InthemiddleofDecember..AWhendoAm
Formostofus,thepurposeoftheholidaysistobringpeace,love,andgoodwilltowardsall.Yet,formany,theholidayseason
Formostofus,thepurposeoftheholidaysistobringpeace,love,andgoodwilltowardsall.Yet,formany,theholidayseason
Formostofus,thepurposeoftheholidaysistobringpeace,love,andgoodwilltowardsall.Yet,formany,theholidayseason
A、Electricitybills.B、Thecostofliving.C、Theheatingsystem.D、Typesofenergy.C
Educatinggirlsquitepossiblyyieldsahigherrateofreturnthananyotherinvestmentavailableinthedevelopingworld.Women
随机试题
圆锥基面距:
男性,36岁,心悸、气短5年,半年来腹胀、下肢水肿。体检:心界扩大,心尖搏动向左下移位,搏动弱,心尖部有S3,S4及Ⅱ级收缩期杂音,双肺底闻及小水泡音,下肢水肿Ⅱ度,临床拟诊扩张型心肌病人院后2天,患者发生左侧肢体软瘫,其原因最可能为
A.入院率偏倚B.信息偏倚C.现患-新发病例偏倚D.选择偏倚E.混杂偏倚限制某些人群进入研究总体的目的是控制
建筑使用管理单位在防爆检查中,通过对()等方面采取防爆措施的检查,可以达到防止燃烧和爆炸的目的。
甲公司委托乙公司加工1000件产品(属于应税消费品),1月20日发出材料,计划成本60000元,材料成本差异率为一3%。2月20日,支付加工费12000元,支付由受托方代收代缴的消费税6600元。不考虑其他因素,则下列说法不正确的是()。
社会主义经济制度是建立在()基础之上的。[2003年真题]
根据增值税法律制度的规定,下列各项中,应当征收增值税的是()。
根据行为的性质及其后果,人类行为可以划分为( )。
课程是衡量教学质量的重要“尺度”,离开这个“尺度”就无法评定教学质量的优劣。()
A市光明公司业务员甲某和本公司另一名业务员乙某代表公司按合同接受4万打进口某产品时,两人发现有溢货现象,即港商多发了200打。甲某让乙不要把这一情况告诉别人。几天后,甲某将200打该产品卖给B市个体商经营者丙某,单价为200元,并让丙将货款汇到C市甲原工作
最新回复
(
0
)