Why do we have red, amber and green on traffic lights and not any other colours?

Answer 1

Because it's simple, and most people are stupid. I would not want to drive around stupid people when traffic lights aren't simple.

Answer 2

These colours are chosen because they can be seen from afar in day and night. Red is a colour of caution and gives a warning feeling to people. Green on the other hand, has a soothing effect, signalling okay to go. When the first traffic light came about, there were only 2 colours - red and green. Amber came about as a transition between the 2 colours. It had to be a colour that is easy to differentiate between red and green. white was a first choice but there were worries that there might be confusion with the street lamps. Thus, the next colour is amber.

Answer 3

Red is visible from a distance & also globally accepted as a color to signify something of importance or danger.

amber is a soft color visible over shorter distances & a soft psychological jolt to wake up & start kicking.

Green is accepted as a color signifying freedom or the synonymous.

I think ;)

Answer 4

Due to wave length of light, red is the highest, we can see from far -it means stop , then yellow - it is ready to go , at last Green- it is all clear

Answer 5

Because it is easier to see...traditionally if you see "red" you know danger.

Yellow or amber is always caution...

Green has meant go. These are the easiest to see.

Answer 6

red stands for danger.
amber stands for might be dangerous
green stands for safe.

i guess is a universal colors understood by many

Answer 7

because they are easy to see even in dark and conditions where there is a glare they are easy to pick out. i had some one tell me that most people that are color blind can distinguish those three colors

Answer 8

universal standard color spectrum and easiest to understand purpose of the three colors nationaly .

Answer 9

primary colors? were you educated on earth?