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世界第一盏电气红绿灯于1918年出现于纽约;上海第一盏红绿灯于1919年出现于法租界;20世纪20年代,上海进而出现自己发明的红绿灯之间的黄灯,1927年,发明者胡汝鼎因此而获奖。
The first electrical traffic light in the world appeared in New York City in 1918; the first traffic light in Shanghai appeared in the French Concession in 1919; in the 1920s, Shanghai then appeared the yellow light between its own invented traffic lights. In 1927, the inventor Hu Ruding So winning.