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Why did they choose red, yellow and green signals for the traffic light?

Red means "stop," green - "go," yellow - "hurry up and turn on this damn green one!" Why exactly these colors? Why not blue, purple and brown, for example?

The answer to this question, as it turned out, was a bit confusing, but there was a definite meaning in it. The very first traffic lights appeared for the machinists, and not for the motorists. They consisted of red and green barriers that fell in front of the gas lamp, which was quite dangerous in case of a leak.

Red came from the railway tracks

Red color symbolizes the danger in many cultures, which from the scientific point of view is explained thus: its light wave is the longest among all visible colors of the spectrum. This means that you can see such a signal from the longest possible distance. Thus, red color meant "stop" long before the appearance of cars. Ever since it came to replace the mechanical "wings" that rise and fall to signal whether the path is free. So, with this figure out, it's not so difficult.

Green first of all means "Attention!"

But the role of green signals has changed over time. The length of the light wave in green is shorter and follows immediately after yellow in the visible spectrum. This means that it can be seen from a greater distance than any other color except red or yellow. At the time of the first railway traffic lights, green meant "Warning!" And permission to go was given to the whites. But to stop the train, the driver needs much more time than the driver of the car. And after several major disasters with the collision of trains occurred due to the fact that the driver confused the bright light of the star with the signal "The road is free," only two colors remained in operation: red and green.

Yellow means "Attention", because it is almost as noticeable as red

With the advent of cars until the mid-1990s, not all stop signals were red, some were yellow. So it was decided to do it for the reason that it was difficult for drivers to notice light at night in a poorly lit area. For a long time, only yellow color was used to indicate the need to stop. It began in Detroit in 1915 - a city that, after 5 years, installed the first electric traffic light with an "amber" color.

But what happened to the original value of the yellow signal? With the advent of electricity and new opportunities, the need to use it as a stop signal instead of red has disappeared. Therefore, the color remained as a sign, warning that it is necessary to prepare.

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