Origin of traffic lights.

Best answer: At the beginning of the 19th century, in York City in the middle of England, women dressed in red indicated that they were married, while women dressed in green were unmarried, so they were inspired by red and green costumes. On December 10th, 1868, the lamp post designed and manufactured by the then British mechanic, Hart, was seven meters high, and a red and green lantern-gas traffic signal lamp was hung on it, which was the first signal lamp in the city streets. In 1914, electric signal lights appeared in Cleveland, USA.

At the beginning of the 19th century, in York City in the middle of England, women dressed in red indicated that they were married, while women dressed in green were unmarried, so they were inspired by red and green clothes. On December 10th, 1868, the lamppost designed and manufactured by Hart, a British mechanic at that time, was seven meters high, with a red and green lantern-gas traffic signal lamp hanging on it, which was the first signal lamp in the city streets. In 1914, an “electric signal lamp” appeared in Cleveland, USA. With the development of various means of transportation and the need of traffic command, the first three-color lamp (red, yellow and green) was born in 1918. It is a three-color circular four-sided projector, which is installed on a high tower in Fifth Street, new york. The inventor of the yellow signal lamp was Hu Ruding of China, who went to the United States for further study with the ambition of “saving the nation through science” and worked as a staff member in General Electric Company of the United States, where the great inventor Edison was the chairman. One day, he stood at a busy intersection waiting for the green light signal. When he saw the red light and was about to pass by, a turning car whizzed by and scared him into a cold sweat. Back to the dormitory, he pondered over and over again, and finally thought of adding a yellow signal lamp between the red and green lights to remind people of the danger. His suggestion was immediately affirmed by the parties concerned. Therefore, red, yellow and green signal lights appear in the world as a complete road tool.

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