Final answer:
White is used as a background for route markers, guide signs, and certain regulatory signs. It is also used as a legend color on signs with brown, green, blue, black, and red backgrounds in road signs.
Step-by-step explanation:
The subject of this question is Geography. The question is inquiring about the use of white color in various road signs and its symbolic meanings in different cultures. White is used as a background color for route markers, guide signs, and certain regulatory signs. It is also used as a legend color on signs with brown, green, blue, black, and red backgrounds.