Are there international standards and unified regulations for traffic signs?

There are international standards and unified regulations for traffic signs. In fact, there is an international body responsible for developing and managing these standards: the World Road Association (PIARC), which operates under the United Nations Economic and Social Council. Established in 1909, PIARC is an international organization dedicated to roads, transport, and infrastructure, with over 120 member countries.

As the authoritative organization in the field of international road signs, PIARC has issued a “World Road Signs Manual” that outlines a range of design principles, pattern standards, and color regulations. The purpose of these standards is to provide guidance and reference for countries in the creation and use of traffic signs. The standards primarily cover the following aspects:

1. Design Principles: Signs should be simple, clear, and easily recognizable, avoiding ambiguity and confusion to ensure that drivers and pedestrians can quickly and accurately understand the information conveyed.
2. Pattern Standards: The manual specifies the basic shapes, patterns, and layouts for various types of signs, including regulatory, warning, prohibition, and informational signs, ensuring consistency and coordination in their appearance.
3. Color Standards: It defines the rules for using different colors on signs, such as red for prohibitions or warnings, blue for information or instructions, and green for directional guidance, enabling drivers to quickly identify and interpret the signs.

Many countries worldwide are members of PIARC and adhere to its standards and guidelines when designing and using traffic signs. Unified standards help improve the accuracy and timeliness of information conveyed on the road, reduce driving errors and accident risks caused by sign differences, and enhance road safety and efficiency.