Now walking in the street people have been accustomed to see traffic lights. But have you ever thought about the traffic lights?

According to records, the world's first red light is used in the UK in 1868 in London's Westminster District m.. When the traffic lights only red and green, is to use the gas light emitting.

By 1914, the traffic lights were used in Cleveland, Ohio, in the United States. This device lays the foundation of the modern traffic command signal.

When the time to enter in 1918, the United States was only in New York City, Fifth Street, a tower on the world's first hand control three color traffic signal lights. And put forward in the original red, green lights to join the yellow signal light is a Chinese creative.

This Chinese man called Hu Ruding, when he was with the science of saving the country's aspirations to study in the United States, Edison, chairman of the U.S. General Electric Appliance Company as chairman of the u.s..

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 in the middle of the red, green lights and a yellow signal lights, to remind people to pay attention to the danger.

His suggestion is immediately relevant to the affirmative. So red, yellow, green three color signal light is a complete command signal family, all over the world, the sea, the sea and air traffic areas.

The following is a few important points in the development of traffic lights:

-1868, the world's first traffic light was born in the United kingdom;

In -1914, the electric light first appeared in the streets of Cleveland, Ohio;

-1918, the United States, New York,, the first red, yellow, green three color hand control traffic lights;

-1925, London introduced three color signal lights, and for the first time before the yellow light as a red light from the "pre" (before this, the United States will be used to indicate the yellow car turn);

-1928, traffic lights Chinese first appeared in the British concession in Shanghai. The earliest traffic signal lights in Beijing first appeared in 1932 in the west to the people lane.

In -1954, the former Federal Republic of Germany first used the pre signal and speed indication of the line control method (using similar lines in Beijing to control traffic lights in February 1985).

-1959 years, the birth of traffic lights controlled by the computer area;

-1987 in November, Beijing first in the eastern side of the 39 junctions using the traffic control of the traffic lights.

Traffic yellow light was invented by the Chinese people!