Quote:
Originally Posted by old greg
Actually red light will travel less distance due to atmospheric absorption. The human eye is also less sensitive to red light then it is to green or yellow, and the Sun creates less red light than it does green or yellow light. But the human brain is hardwired to notice red because it is the color of blood and, by extension, danger.
Stop signs are red because stop lights are red. Before the 1950's stop signs were yellow w/ black writing, but were changed to match stoplights. And traffic lights are red=stop because they were invented by a railroad engineer and on railroad signals, red=stop.
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While you're on the subject, the human eye is a bit deceiving when observing objects. Red looks interesting due how much of it is used, leading to make it look like something is moving, hence my original post. Kind of like thinking a straight road is straight, when it's following the curvature of the earth in a straight line.