《集邮博览》2004年第4期刊有《红绿灯的来历》一文,该文介绍了红绿两色信号灯的来历。 三色交通信号灯为什么首先在美国出现,黄色信号灯的发明者又是谁呢?据《华夏时报》介绍,黄色信号灯的发明者是中国人胡汝鼎。 上世纪20年代,胡汝鼎怀着“科学救国”的抱负到美国深造,在爱迪生为董事长的美国通用电器公司任 “Philatelic Expo” in 2004 the fourth issue of “origins of traffic lights,” a text, introduced the origins of the red and green lights. Why did the three-color traffic light first appeared in the United States? Who is the inventor of the yellow light? According to the China Times, the inventor of the yellow light was Hu Ruding. In the 1920s, Hu Ru-ding, with the ambition of “saving the nation by science”, went to the United States for further studies. At Edison, General Electric Company, with Edison as chairman,