What is normally the shape of traffic signs that give orders?

Traffic signs that give orders, such as regulatory signs that inform drivers of certain actions they must take, are typically circular in shape. This design simplifies recognition, as circular signs convey a sense of immediacy and alertness. The round shape is visually distinct and helps in quickly communicating essential rules or regulations, such as "No Parking" or "Speed Limit," which dictate specific actions that drivers are required to follow.

In contrast, the other shapes serve different purposes. For example, triangular signs generally indicate warnings and are meant to alert drivers to potential hazards. Square and rectangular signs often provide information or guidance rather than impose mandates. Meanwhile, pentagonal shapes are used for school zone warnings, which is another specific category and not related to general regulatory commands. Understanding the significance of these shapes aids drivers in interpreting traffic signs and adhering to road rules effectively.