What is the minimum height for letters on stop/slow retroreflective paddles?

The minimum height for letters on stop/slow retroreflective paddles is 6 inches. This specification is established to ensure that the instructions on the paddles are clearly visible to drivers from a safe distance. The size allows for effective communication of the messages to motorists, especially in varying visibility conditions. Ensuring the letters are a minimum height of 6 inches aids in prompt recognition and understanding, which is crucial in maintaining safety in work zones or areas where flaggers are present. This standard is part of the regulations to facilitate effective traffic control and minimize confusion for vehicles approaching a worksite.