首页
登录
职称英语
Even during the horse and carriage days, traffic in big cities was often hea
Even during the horse and carriage days, traffic in big cities was often hea
游客
2025-03-27
24
管理
问题
Even during the horse and carriage days, traffic in big cities was often heavy. Police officers had to be stationed full time directing traffic at busy intersections.
The world’s first traffic light came into being before the automobile was in use, and traffic consisted only of pedestrians, carriages and wagons. On December 10, 1868, the first traffic lights were installed outside the British Houses of Parliament in London, by the railway engineer J. P. Knight. They resembled railway signals of the time, with signaling arms and red and green gas lamps for night use. The gas lantern was turned with a lever at its base so that the appropriate light faced traffic. Unfortunately, it exploded on 2 January 1869, injuring the policeman who was operating it.
The modern electric traffic light is an American invention. As early as 1912 in Salt Lake City, Utah, policeman Lester Wire invented the first red-green electric traffic lights. On 5 August 1914, the American Traffic Signal Company installed a traffic signal system. It had two colors, red and green, and a buzzer, based on the design of James Hoge, to provide a warning for color changes. The design by James Hoge allowed police and fire stations to control the signals in case of emergency. The first four-way, three-color traffic light was created by police officer William Potts in Detroit, Michigan in 1920.
Timers on traffic lights were first seen in Taipei, China, and then brought to the U.S. after an engineer discovered its use. Though uncommon in most American urban areas, timers are still used in some other Western Hemisphere countries. Timers are useful for drivers to plan if there is enough time to attempt to cross the crossroad before the light turns red and the amount of time before the light turns green.
The colors of the traffic lights are psychologically associated with the message they are meant to transmit. Red is classically seen as a color representing danger or caution.(There are countless phrases and idioms that use "red" as a message of the bad or unknown—"in the red" and "seeing red.")Green, on the other hand, is a reassuring color in most cultures—the color of nature and growth; of harmony, freshness, and fertility. Green has a strong emotional correspondence with the idea of safety, and was intuitively chosen to guide pedestrians responsibly through an intersection. [br] The first electronic traffic light was invented by______.
选项
A、James Hoge
B、J. P. Knight
C、Lester Wire
D、William Potts
答案
C
解析
第三段前两句说现代的电子信号灯是美国人发明的。1912年犹他州盐湖城的警察Lester Wire发明了第一个电子红绿灯。
转载请注明原文地址:https://tihaiku.com/zcyy/4014199.html
相关试题推荐
Itisallverywelltoblametrafficjams,thecostofpetrolandthequick
Itisallverywelltoblametrafficjams,thecostofpetrolandthequick
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
AccordingtotheU.S.NationalHighwayTrafficSafetyAdministration(NHTSA),ca
ThisbookcangiveyouaglimpseoftheenduringappealofthepoemsfromtheTa
Evenduringthehorseandcarriagedays,trafficinbigcitieswasoftenhea
随机试题
TheJointStatementontheFrameworkforCooperationstipulatesthatboththepa
社教服务类主持人的语言要?()A.深入浅出,耐心细致,富于生活气息 B.感情
女性,24岁,2月前药物流产,见妊娠囊排出,流产后阴道持续少量流血。查体:腹软,
某证券公司为了维护客户的知情权,应当向客户披露董事、监事、高级管理人员薪酬管理信
体型中最有代表性的差异是()A.皮肤之厚薄 B.肤色 C.腠理之坚松
2015年,我国规模以上电子信息产业企业个数6.08万家,其中电子信息制造企业1
()即是家庭在问题解决能力、沟通、家庭角色分工、情感反应能力、情感卷入程度、行
使用环磷酰胺化疗,以下检查结果可能升高的是A.白细胞计数 B.血小板计数 C
根据资源税法律制度的规定,下列各项中,不属于资源税征税范围的是()。A.开采的
施工文件档案卷内的文字材料按事项、专业顺序排列、同一事项的请示与批复、同一文件的
最新回复
(
0
)