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The change of traffic lights
Nov 26, 2018

With the development of various means of transport and the need for traffic command, the first veritable three-color lamps (red, yellow, green three signs) were born in 1918.

It is a three-color circular four-sided projector, installed on a high tower on Fifth Street in New York City, and because of its birth, urban traffic has been greatly improved. The inventor of the yellow signal lamp is the Hu Ruding of our country, he with  "scientific salvation " ambition to further study in the United States, in the great inventor Edison as chairman of the United States General Electric Company. One day, he stood at the bustling intersection waiting for the green signal, when he saw the red light and was about to pass, a turning car exhaled, scaring him in a cold sweat. Back in the dorm, he pondered, and finally thought of adding a yellow signal in the middle of the red and green lights to remind people of the danger. His proposal was immediately affirmed by the parties concerned. So the red, yellow, green three color signal is a complete command signal family, throughout the world land, sea and air transport field.

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