• EN/GB
  • My Account
Why Does a Red Light Mean

Why Does a Red Light Mean "Stop" and a Green Light Mean "Go"?

Posted On 06 Apr, 2018

Read More

Red and green have more significance in our lives than other colours. We have been made to learn from the beginning that red is a signal to stop and green is a signal to carry on. This is definitely inspired by the traffic lights that signify, more or less, the same thing. But have you ever wondered why were the colours red and green chosen? Why not a different colour? Let’s find out.

The first set of traffic lights were used sometime around 1870 in England; it was a natural gas lamp bicolour red and green, operated by an agent, installed at a level crossing Rail - at the time the cars to thermal engine weren’t in the picture.

At first, railroad companies used red to mean stop, white to mean go, and green to mean caution. As you could imagine, train conductors ran into a few problems with white meaning go. For instance, one train conductor mistook a bright star for a white light and thought he was all clear. Because of incidences like that, railway companies eventually moved green meaning go, and it’s been that way ever since.

Red and green are the colours perceived more quickly by the human brain. The human eye is particularly sensitive to red, it can be perceived from a great distance. A single photo-receiver of the eye perceives red, unlike other colours which are detected by several photo-receivers: The result is that the brain is more quickly warned of the presence of the red colour in the field of vision as that of others.

The choice of green stems in accordance with the choice of red. In fact, green is the complement of the red on the chromatic circle and is also well perceived by the eye and the brain. As to orange, which is the colour of the warning of a danger, it is located at an equal distance of chromatic red and green.

The next time that you will be in front of a red light - for example, on the occasion of a 5-day test drive of a used car that you plan to buy - you will better understand why you stopped.

Other Articles

What is Fuel Injection Service? When to use it?

What is Fuel Injection Service? When to use it?

Read More

Factor You Should Consider Before Purchasing A Car

Factor You Should Consider Before Purchasing A Car

Read More