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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク History of traffic light ： ウィキペディア英語版 History of traffic light The History of Traffic Lights. ==Description== A traffic light is a device that is designed to control the flow of traffic by using three colored lights. These lights are mainly green, yellow, and red. In 1860s London, the first traffic control device had arms that extended out to command drivers on how to react at an intersection .〔 Sessions, Gordon M. Traffic Devices: Historical Aspects Thereof. Washington: Institute of Traffic Engineers, 1971. Page 8〕 The first four way three color traffic light did not come until December 1920 in Detroit .〔 Sessions, 43〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「History of traffic light」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.