What are the primary colors of traffic signs that indicate stop, yield, and other regulations?

Traffic signs that indicate stop, yield, and other regulatory instructions primarily utilize the colors red and white. Red is universally recognized as a signal for stopping or prohibiting certain actions, such as in "STOP" signs, which use the distinct red color to attract immediate attention and indicate the need for a complete halt. Similarly, yield signs are often red and white as well, guiding drivers to yield to oncoming traffic or pedestrians.

The use of white as a background helps in maintaining clarity and visibility, allowing the red messages to stand out effectively, ensuring that drivers can easily identify and respond to critical safety information while on the road.