Red was first chosen because it is the most visible colour from a distance. The wavelength of red light is able to penetrate further through fog, dust and clouds, so you can see a red sign even in the dark or on a misty day.

Why are the danger signals red in color? Ans. As the red light has the highest wavelength among all the colours, so it is scattered the least. Due to which most of the light gets reflected back and can travel longer distances through rain, fog, dust etc. to reach our eyes effectively.

Studies reveal that red is the most attractive colour to both men and women but, curiously, the two genders are attracted to the same colour for different reasons. Women are attracted to men wearing red because, according to one study, it sends signals of status and dominance.

The main reason why the red colour is used to in the traffic signals to stop the vehicle is that red is scattered the least by the air molecules. Red has the highest wavelength of all the colours, and it is scattered the least. So, it can travel the longest distance and can penetrate through rain, mist and fog.

In traffic signals red colour light is used to stop vehicles because it is having longer wave length. The colour which is having longer wavelength will undergo lesser scattering, hence it is visible from a longer distance. So red light is able to travel the longest distance through fog, rain, and the alike.

Danger signals are red in color because it is scattered the least by air molecules. Since the color red has the highest wavelength of all the colors we can see it scattered the least. So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc.

Too much blue can create feelings of melancholy, negativity, sadness, self-righteousness, and self-centeredness. Too little blue brings about qualities of suspicion, depression, stubbornness, timidity, and unreliability.