Until 1920, the signal light would have all three colors: blue, red, and yellow; invented by police officer Williams Posst, living in Detroit. In 1923, Gerrette Morgan received the patent for the traffic light, although he was not the one who revolutionized the modern signal light.
The reason that led to that invention of Morgan was due to the accident occurred in many US streets during those years. He felt a need for a unified standard for an existing signaling system to work properly. After researching, Morgan designed a T-shaped lamppost. In which signals like: “stop”, “go” and “stop in all directions”. Only pedestrians are allowed to cross the street when the “stop in directions” signal is displayed. After 1923, the system still required an operator. In New York City alone, more than 100 policemen work 16 hours daily with a total salary of $ 250,000 per year. Due to the aforementioned difficulties, engineers are ordered to set up and develop automatic operating lighting systems. However, nearly 20 years later, that dream of the new policemen comes true.
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