Semi-old cars today have worn out taillight covers (because in the 90's the plastic over the taillights wasn't thick enough), which slightly brightens the lights. Over time, they do turn orange or even white from time to time.
Hope that answers your question.
Ships and trains both used red warning signals long before there were automobiles.
Red is the first color your eye determines; since it has the longest visible wavelength, you interpret the color red quicker than any other color. Psychologically, we have a slight "fear" of red because it denotes blood, a natural color; by extension, this means danger and a warning.
For further [wikipedia]red[/wikipedia]ding...oops, I meant Redding. Or was that Reading?
How come, in that case, that the R32 GTS-t sweeps the floor even with the R33 and its faded pinkish lights? Oh, wait...Ah, so this must mean the R33 GT-R is meant to be more scary than the R32 GT-R...
DE