Final answer:
Rectangular and square-shaped black and white or red and white signs typically indicate regulatory traffic information. The shape and color of a sign help in quick recognition and understanding by drivers. Moreover, symbols can convey cultural or political messages when used outside their usual context.
Step-by-step explanation:
Rectangular and square-shaped signs that are normally black and white or red and white are typically regulatory traffic signs such as speed limit signs or stop signs. These types of signs inform drivers about traffic laws and regulations. Certain shapes and colors have been standardized to facilitate quick and easy recognition by motorists. For instance, a rectangular sign with black and white colors often indicates a speed limit or other regulatory information, while a red and white sign is universally recognized as a stop sign.
Symbols and signs can also carry significant cultural or political meaning when used in unconventional contexts. For example, a stop sign on the door of a corporation or a military jacket worn during a protest can make a powerful statement. They defy traditional norms and can represent a form of communication and expression quite separate from their intended use.