If a sign was facing north/south with white text on it, the text would have a light gray shade instead of white, but if the sign faces east/west, the text would be white.
If a sign was facing north/south with white text on it, the text would have a light gray shade instead of white, but if the sign faces east/west, the text would be white.
Actually the text on all signs has the same color. This is just an optical illusion.