What are the colors and shapes of speed limit signs?

Speed limit signs are typically black and white to ensure high visibility and clarity. This color scheme is used because it reflects the regulatory nature of these signs, indicating rules that all drivers must follow. The square or rectangular shape helps emphasize that these are regulatory signs, which communicate essential information about driving limits in specific areas.

In contrast, other options presented refer to different traffic signs. For example, red and triangular signs are generally used for yield signs, while yellow and diamond-shaped signs indicate caution or warning areas that require a driver to be alert for potential hazards. Green and circular signs are associated with guide signs that provide directional information or distances to locations. Understanding these distinctions is crucial for safe driving and compliance with traffic regulations.