At the beginning of nineteenth Century, in the middle of the city of York, red and green, representing the different status of women. Among them, a red woman that I have to get married, a green woman is unmarried. Later, the British Parliament building in London before often occur accident of the carriage rolled, so people are red green inspired, December 10, 1868, the first member of the family lights on in the houses of Parliament in London, the square was born, by the then British mechanical morality, Hart design, manufacturing lamp 7 meters high, hanging from the body of a red, green and white Lantern - gas traffic signal lamp, which is the first city street lamp lights. In the light of the foot, with a long rod the police want to affect the conversion lantern belt color. Later in the center of the signal lamp is installed on the gas lamp, it is in front of two red, green glass alternating block. Unfortunately available only 23 days of gas lights out since the explosion, a police on duty are also ruin their lives.

From then on, the city's traffic lights were banned. Until 1914, in the United States of Cleveland, the first to restore the traffic lights, but this time is the electrical signal". Later, in New York and Chicago and other cities, have been re emergence of traffic lights.

With the development of various means of transport and traffic control needs, the first truly three color lights (red, yellow, green three kinds of signs) was born in 1918. It is surrounded by a circular three color projector, was installed in New York City on the 5th Street. One of the towers, since its birth, the urban traffic is greatly improved.

The inventor of the yellow signal lamp is our country's Hu Ruding, he is with the "science save the country" the aspiration to the US studies, in the big inventor Edison is the president of the United States General Electric company. One day, he stood in the busy intersection wait for the green signal when he saw a red light and going to the past, a car turning car shouts that the ground brush and, threatened him in a cold sweat. Back to the dormitory, he repeatedly pondering, and finally thought of in the red, green and green, plus a yellow signal lights, to remind people to pay attention to danger. His suggestion immediately got the relevant aspects of the affirmation. So red, yellow, green three color signal that a complete command signal family, all over the world land, sea and air traffic areas.

Chinese the earliest road traffic lights, is the British concession in 1928 in Shanghai.

The electrical control from the earliest hand to 1950s, from the use of computer control to the modern electronic timing monitoring, traffic lights in the scientific, automation, constantly updated, development and improvement.

The above information is provided by the traffic signal lamp factory