This panel, placed below a vertical sign, ...
Signage: Vertical signs
Explanation
Supplementary panel: fog under a vertical sign
The panels placed beneath a **vertical sign** are **supplementary**: they specify under which **weather conditions** the main sign applies. They can indicate **snow**, **rain**, or, as in this case, **fog**. Thus, the warning or restriction of the sign above applies specifically when there is **fog**.
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