Traffic regulations are primarily communicated with which shape of sign?

Traffic regulations are primarily communicated using rectangular signs. These signs convey important information about rules, regulations, and instructions that drivers must adhere to. For example, rectangular signs can indicate speed limits, lane usage, or other essential traffic rules. They are designed to be easily recognizable and understood by drivers to ensure compliance and enhance road safety.

While other shapes, such as the octagon, triangle, and diamond, have specific meanings—like stop signs, yield signs, and warning signs, respectively—rectangular signs are the ones typically used for conveying regulatory information. This allows for a standardized approach to traffic communication, making it easier for drivers to follow the rules of the road.