What is the purpose of supplementary panels placed beneath a vertical road sign?

Question

DentroTest · Accepted Answer

Supplementary panels (generally the S-800 series) are rectangular plates placed beneath vertical signs to specify their meaning. The correct answer is that they serve to provide additional details, clarify, or limit the scope of the main sign. For example, they may indicate the distance to the start of a hazard, the length of the affected section, or specify that the sign only applies to certain vehicles (such as trucks) or at certain times. They have no validity on their own but rather complement the sign they accompany. The options regarding reversing or suspending validity are incorrect and do not correspond to the regulatory definition of these panels.

What is the purpose of supplementary panels placed beneath a vertical road sign?

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