Traffic lights, commonly known as the "red light", is now each traffic participant must contact the road infrastructure, and it was born to back to the car before the birth of December 9, 1868, has a red green shade gas lights outside the Houses of Parliament in London at the light, the history of the world's first the traffic signal lamp was born.

It is well known that the maximum effect of traffic lights is to increase the traffic efficiency. However, in nineteenth Century, the most fundamental purpose of the invention of traffic lights is to save lives, because only in 1866 a year, London street traffic accident caused 1436 casualties. To this end, the 38 year old Briton J.P. knight decided to design a set of signal system, alleviate the problem.

J.P. Knight (J. P. Knight) the occupation is a railway engineer, he also invented the traffic lights and railway signal lamp was very similar. The lights during the day with the shape of a pair of red and green color of the cross arm signal indication, the evening is the use of green gas lamp can be rotated to replace the arm signal, signal transformation by the police manual control pole below.

1868, to complete the design of the traffic lights of the knight, and put into use at the intersection of London Houses of Parliament outside Great George street and Bridge street. The traffic lights the streets of London traffic conditions have been improved, the number of accidents is reduced in a carriage.

However, the first light traffic signal lamp posts in less than a month because of a gas leak explosion occurred, the police also control it so seriously injured (or killed), then the British government will be removed. Since then, the traffic lights have been quiet for several decades, until the Saline Lake city police Lester Wayer developed a power signal lamp in 1912, and it's only on the stage of history.

The above information is provided by the traffic signal lamp factory