Semáforo LED de 200 mm | La aparición de los semáforos rojos, amarillos y verdes
Semáforo LED de 200 mm | The emergence of red, yellow and green traffic lights
With the development of various means of transportation and the needs of traffic command, the first veritable three-color light (red, yellow and green three signs) was born in 1918. It is a three-color circular four-sided projector that was installed on a tower on Fifth Street in New York City, and thanks to its birth, urban traffic has been greatly improved.
The inventor of the yellow signal light is my country's Hu Ruding. With the ambition of "saving the country through science", he went to the United States to further his studies and worked in General Electric Company, where the great inventor Edison was the chairman. One day, he was standing at the bustling intersection waiting for the green light signal. When he saw the red light and was about to pass, a turning car whirring past him, scaring him into a cold sweat.
Back in the dormitory, he pondered over and over again, and finally thought of adding a yellow signal light between the red and green lights to remind people to pay attention to the danger. His suggestion was immediately affirmed by the relevant parties. Therefore, the red, yellow and green signal lights are a complete command signal family, all over the world's land, sea and air traffic fields.
With the development of various means of transportation and the needs of traffic command, the first veritable three-color light (red, yellow and green three signs) was born in 1918. It is a three-color circular four-sided projector that was installed on a tower on Fifth Street in New York City, and thanks to its birth, urban traffic has been greatly improved.
The inventor of the yellow signal light is my country's Hu Ruding. With the ambition of "saving the country through science", he went to the United States to further his studies and worked in General Electric Company, where the great inventor Edison was the chairman. One day, he was standing at the bustling intersection waiting for the green light signal. When he saw the red light and was about to pass, a turning car whirring past him, scaring him into a cold sweat.
Back in the dormitory, he pondered over and over again, and finally thought of adding a yellow signal light between the red and green lights to remind people to pay attention to the danger. His suggestion was immediately affirmed by the relevant parties. Therefore, the red, yellow and green signal lights are a complete command signal family, all over the world's land, sea and air traffic fields.
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