Utility News : Why are red, yellow, and green colors used in traffic signals?

You must have seen the traffic signal on the road which consists of red green and yellow three colored lights. But have you ever wondered why only red, yellow, and green are used in traffic lights?

The red color is very thick as compared to other colors, it leaves the first effect on the retina of our eyes. It is visible from far away.
Apart from this, the red color is also a symbol of danger.

Yellow color is a symbol of energy and the sun indicates to be ready to collect its energy.

Green color symbolizes nature and peace which is soothing to the eyes. This color is the opposite of danger, so it indicates moving forward.